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Old Tinned Copper Cookware?

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Karl View Drop Down
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    Posted: 24 January 2012 at 18:41
First off, I enjoy reenacting a few historic time periods and I love cast iron but cast iron cookware seems to have "magically" appeared fully formed in 1607 (but that is a long story too.)  In an attempt to create a more historically authentic camp kitchen I am experimenting with earthenware and tinned copper cookware. 

Copper can be a bit pricey to collect and much smaller than the cast iron that I have gotten used to using.  I am researching how to safely re-tin the insides of various copper items like:



The more I read about copper toxicity the more concerned that I am getting.  The conflicting information is even more disturbing.  OK, I understand cooking tomatoes in unlined copper is bad.  What else is bad to cook in unlined copper?  Are there things that are not even safe to cook in tinned copper?  I see a few sources that say no food should be left to cool in any copper or tin(?)   I understand that tin melts at a relatively low 450F so there goes some styles of cooking and that wooden spoons are best to avoid scratching the soft tin.

Copper cookware owners - how all do you use your copper to best effect?  What are your tips?  Why does most copper cookware not seem to use lids?   What foods does copper cook best? 

I enjoy the challenge of trying to prepare old foods as authentically as possible to experience how our grandcestors lived but I am not anxious to join them.  I do not recall having to worry about my cast iron poisoning me.  
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TasunkaWitko View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote TasunkaWitko Quote  Post ReplyReply Direct Link To This Post Posted: 25 January 2012 at 09:04
karl - i really, really like your sense of authenticity and research! i don't own any copper cookware, but am interested in learning more about it.
 
you mention the reaction that it has with tomatoes - perhaps that's where the early notion that they are poisonous came from, if they were using copper before 1607? possibly....
 
i'm afraid i don't know much on the subject, but i will be reading it with interest. thank you for introducing this new aspect to historical cooking here. this is exactly what this site is about!
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Karl View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Karl Quote  Post ReplyReply Direct Link To This Post Posted: 25 January 2012 at 11:03


My goal is to have a painfully period 16th century camp kitchen.  I have been picking other folks' brains for years now like on Landsknecht.org or http://forums.armourarchive.org/phpBB3/viewtopic.php?f=4&t=139098&hilit=cast+iron 

http://api.ning.com/files/kUPB6lcJi-6dT33B*kcEyTu0XKbadI6PuvMH--eij9OEJdRQu48QWB*VhtKsImDH75SAPuhht*XHSxXnQiiIUWdGhkhHpe9K/PotsandPansHistory.pdf

For now I would like to hear from die hard copper cookware fans. 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Rod Franklin Quote  Post ReplyReply Direct Link To This Post Posted: 25 January 2012 at 18:42
http://www.youtube.com/watch?v=GXBsCOabS3U

Just because it's interesting.


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Karl View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Karl Quote  Post ReplyReply Direct Link To This Post Posted: 27 January 2012 at 08:16
No gloves when he tins the copper pot?  It looks like he may have done this more than once.Wink  This does give me a better idea what I am getting into.  I need to gather the materials and tools (tin, flux, "brush", propane) and get all of my pots ready at once.  All of the smoke from the flux means that I need to do it outside when the snow goes away here.  Thanks!
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Post Options Post Options   Thanks (0) Thanks(0)   Quote TasunkaWitko Quote  Post ReplyReply Direct Link To This Post Posted: 27 January 2012 at 08:57
i've got a buddy who might have some information on this. i'll pass this link to him and see if we can pick his brain a little ~
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Karl View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Karl Quote  Post ReplyReply Direct Link To This Post Posted: 27 January 2012 at 10:30
What I would like to know the most about retinning is what the rag/brush is actually made out of.  I have seen the expression "moleskin" brush but then they mention it being denim and linen(?)

Are there any foods that react dangerously even with a good tinned copper pot? 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Rod Franklin Quote  Post ReplyReply Direct Link To This Post Posted: 27 January 2012 at 17:12
I think any thick, no fuzz, cotton or linen cloth would work fine. Old pair of jeans and the like. I think you're just trying to smear the molten metal smoothly and without burning yourself. The rag itself won't burn. I've brazed plenty and a smooth, thick natural material rag folded several times worked fine for any wiping that needed to be done. As the rag browned from the heat and wiping, it would become smooth, almost shiny. It also seemed to pick up flux, so I'm guessing in this application the rag would get better the more pots you did. To a point, because it would eventually burn through.

In reference tot the video, it looks as if the guy would check for the proper heat with the powdered rosin, then throw a little rosin in the pot, throw a little tin in the pot and wipe it on with the rag that was dipped in the powdered rosin. As it seemed that the heat suited him, he threw enough tin in there to do the job and would add rosin as seemed necessary. You can see the molten tin rolling along in the bottom crease of the pot. Heat and wipe, rosin, heat, wipe. Then he let it cool a little then did it again to get a little thicker tin surface. Oh yeah, it a cinch he's done it before.

He's also got the added complication of the charcoal fire.

The following taken from a website for a company that re-tins pots:

What is Tin

Tin (Sn) is a soft, malleable, silver-color metal. It is generally used to coat other metals and to make alloys.

Tin is not reactive to acidic foods, it is not allergenic, does not rust, and can be easily refurbished, and at a very reasonable cost, compared with other metals..

It is the preferred choice of lining for cooking utensils and molds made of otherwise reactive metals, like copper and steel. It is also used to coat steel used for cookie cutters, to help prevent rusting.

 
What is the Color of Tin

Tin is a silvery metal when new, however it becomes darker with cooking. This is normal and in no way interferes with the properties of the metal.

Often, the darkness caused by dried, stuck-on food is mistaken for the bare copper or steel. To test this, wet a paper towel and gently rub a small spot with a little cleanser. If it becomes silver in color, the color is dried foodstuffs - otherwise you will clearly see the copper or steel, a sign that the utensil may require re-lining with tin.

How to Use Tin-Lined Cookware

Stove top cooking generates higher temperatures than tin's melting point (about 450°F or 230°C), however liquid being heated in a tin-lined pan will absorb a lot of excess heat and help keep the tin intact. The majority of oven-baked recipes call for temperatures that will not harm a tin lined utensil that is properly used.

Whether on the stove top or in the oven, the principle is the same: prolonged (and unnecessary) high heat will damage the lining. With any quality cooking utensil, high heat is rarely necessary, and the best results come from moderate heat.

Use only wood, nylon, silicone or other non-metallic utensils to stir and scrape.

How to Care for Tin-Lined Cookware

Tin is a soft metal and should be cleaned with a dishcloth or sponge. Never use abrasive cleaning materials, such as metal scouring pads or metal scrapers.

As with all metal utensils, avoid using cleansers and detergents that contain high percentages of free alkali or acid.

Tin is reactive to tri-sodium phosphate, meta-silicate and chlorine. Avoid using detergents or cleansers containing high quantities of these materials.

Rinse thoroughly after washing and dry to avoid spotting. Tinned steel should be dried thoroughly immediately after washing to prevent rust from forming on spots where the tin might have worn off the steel, and around edges where turned, soldered or welded.

Store tinned items in a dry location.

Re-Tinning Metal Cooking Utensils

Most tin coated pans will require re-lining at some point, to make them like new again.

When not to tin:

In the case of copper, the tin prevents reaction with acidic foods. If you're not cooking acidic foods, then it's not necessary to have a tin lining. Also, if the copper pot is going to be subjected to very high temperatures, such as for making hard candy, the copper needs to be bare in order to support the high temperatures. And bare copper is desirable in making meringues, because of its reaction to egg whites, which makes them peak faster and longer.

In the case of steel, the tin coating basically prevents rusting and reaction with acidic foods. If you are using the pan for baking and you keep it dry and well oiled when in storage, re-tinning, though desirable, is not necessary. Any bit of rust can be scoured off.

In the case of antiques, we don't recommend re-tinning, as doing so is likely to diminish the item's value as an antique. If you plan to use it, however, and it is in good condition, then re-tinning may prove worthwhile.

Avoid using cleansers and detergents that contain high percentages of free alkali or acid. Tin is reactive to tri-sodium phosphate, meta-silicate and chlorine. Avoid using detergents or cleansers containing high quantities of these materials. Check the labels on your household cleaners.


Dry thoroughly immediately after washing to prevent rust from forming on spots where the tin might have worn off, and around edges where turned, soldered or welded.

Store tinned cutters in a dry location.

How to Renew Rusted Tinned Steel Cutters

Use fine sandpaper to remove the surface rust, hand wash with hot sudsy water, dry thoroughly, and use.

Before storing, hand wash with hot sudsy water, dry thoroughly, lightly coat the cutters with mineral oil from a cloth or paper towel, and place in a plastic bag.

We recommend mineral oil over vegetable oil because it does not get sticky or become rancid. Food grade mineral oil is readily available in supermarkets and drug stores.

Often, the oily content of cookie dough can be enough to keep cutters from rusting, and they need only be wiped with a paper towel if frequently used. If used infrequently, we recommend hand washing, drying thoroughly, and lightly coating with mineral oil before storing.

Re-tinning such cutters is not practical nor recommended.


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Post Options Post Options   Thanks (0) Thanks(0)   Quote Karl Quote  Post ReplyReply Direct Link To This Post Posted: 28 January 2012 at 18:40
Rod - Thank you for the information!  I also see some references to cooking milk in unlined copper too:

http://en.wikipedia.org/wiki/Copper_toxicity

It is not very clear whether cooking milk in unlined copper pots is only a danger to certain people or not(?)  It would seem to me that copper's conductivity and lower heats would otherwise be good for cooking milk. 

Tin seems to be a very safe metal: http://en.wikipedia.org/wiki/Tin_poisoning 

Bronze is a mixture of about 90% copper and 10% tin (while modern food safe pewter is about 90% tin and 10% copper) so how much safer for cooking is it then unlined copper?  I notice that this maker offers his bronze cauldrons with tin lining: http://thadenarmory.com/sell/cookware/cookware.htm  I do not own any bronze cookware yet (I am cheap) but it seems very appropriate to the time period(s) that I am trying to recreate. 


16th Cent. "leaded-bronze" cauldron.

I know a fellow in Alabama who is doing some backyard bronze and iron casting.  If I understand him correctly, he is carving items out of BlueBoard, packing them in dry sand, then just pouring the molten metal in(?)  Apparently the molten metal evaporates the foam.  Unfortunately my little kiln would not hold a crucible much bigger than a beer can.  Ermm   Does anyone here know if a rivet forge could get hot enough to melt copper/bronze? 






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Post Options Post Options   Thanks (0) Thanks(0)   Quote Rod Franklin Quote  Post ReplyReply Direct Link To This Post Posted: 28 January 2012 at 20:08
Oh yeah, that'll get hot enough. What will you use for a crucible?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Karl Quote  Post ReplyReply Direct Link To This Post Posted: 30 January 2012 at 13:39
Originally posted by Rod Franklin Rod Franklin wrote:

Oh yeah, that'll get hot enough. What will you use for a crucible?


http://www.backyardmetalcasting.com/

http://codesmiths.com/shed/things/smithing/casting/

I am getting a few suggestions for what to use as a crucible.  This project will need to wait a while so the weather can clear up a bit here.   We are not getting hit as hard as Cordova this winter but we still have too much snow to get much done outside. 

I also won a nice looking footed copper cauldron on Ebay but it has not had time to arrive yet.  It is supposed to be a usable 2+ quarts size.  I probably need to just take pictures of what all I have so far. 


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Post Options Post Options   Thanks (0) Thanks(0)   Quote Rod Franklin Quote  Post ReplyReply Direct Link To This Post Posted: 30 January 2012 at 17:30
You are an ambitious individual. Go for it, have fun and take pictures!
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Post Options Post Options   Thanks (0) Thanks(0)   Quote TasunkaWitko Quote  Post ReplyReply Direct Link To This Post Posted: 01 February 2012 at 09:13
this is an interesting discussion, guys - please keep us updated!
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Rod Franklin Quote  Post ReplyReply Direct Link To This Post Posted: 01 February 2012 at 11:07
After watching a couple of other vids and another video of the same old timer doing a colander, I will update my opinion of the cloth used to 100% cotton cheese cloth, wadded up into a round pad.

http://www.youtube.com/watch?v=mXZGsosR-1E&list=PLA25D9C130344C427&index=2&feature=plpp_video

Notice how this time he actually mixes flux and tin together in the hot colander before wiping it around, and how this time he picks up bits of tin with the rag from his pan off the heat and melts it on the hot colander as he wipes it around.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Rod Franklin Quote  Post ReplyReply Direct Link To This Post Posted: 01 February 2012 at 11:30
Then there's the git-r-dun method...

http://www.youtube.com/watch?v=I4VB3uGIQL0&feature=related

She might be using paper towels to wipe with and towards the end it appears that some sort of hot acid is being used to prep the pots before starting.

No care given to the hole burned in the roadway... Or what type of wood is used. Maybe the finish wouldn't be very smooth or of even thickness either. I think I would rather pay the old timer in the first few videos to re-tin any cookware I might have.


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Post Options Post Options   Thanks (0) Thanks(0)   Quote Karl Quote  Post ReplyReply Direct Link To This Post Posted: 06 February 2012 at 08:24
Thank you for these videos.  They are helping me feel more confident about trying this (when the weather warms up a little).

Here is a site for a coppersmith: http://www.stumpblufftradingpost.com/  and his more detailed FB page: http://www.facebook.com/pages/Stump-Bluff-Trading-Post/200681260448
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Karl Quote  Post ReplyReply Direct Link To This Post Posted: 16 February 2012 at 17:25
I just received a copper cauldron (and not quite mated copper double boiler) that I won on Ebay.  It seems to be 2+ qts and is similar to this one:



It is not tinned (the double boiler top is tinned) and will take some cleaning but is fairly heavy copper and a nice usable size.  I'll try and post real pictures when I have cleaned it up.

So what all food is absolutely safe to cook in unlined copper?  Candy?  Egg whites?  Corn mush?  Boil water?   Nothing really? 



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Post Options Post Options   Thanks (0) Thanks(0)   Quote TasunkaWitko Quote  Post ReplyReply Direct Link To This Post Posted: 16 February 2012 at 21:06
nice-looking cauldron, larl! not sure what is safe and what isn't, but we should be able to find some answers ~
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Karl Quote  Post ReplyReply Direct Link To This Post Posted: 20 February 2012 at 13:34


This is most of the copper that I have collected so far.  The 2qt cauldron in the front left is the newest find.  Is the funny tulip shaped pot in the center a "French potato steamer?"
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Post Options Post Options   Thanks (0) Thanks(0)   Quote toomuch Quote  Post ReplyReply Direct Link To This Post Posted: 20 February 2012 at 21:45
Hello all;

New to this list but not to antique copper cookware.  Currently, I am working on a documented field kitchen based on Scappi's Opera field kitchen from 1570.  Many of the pieces are antique, have been made for me or I have made myself, with a lot of help of course. I have tinned several pieces of cookware, it looks a lot easier than it actually is.   It takes a lot of practice to wipe on a smooth coating of tin.  I have made wattle fences for the kitchen and now making willow baskets for storage.
 
If anyone is interested, I can post pictures of my kitchen, it isn't specific to any one country or time, just a lot of pieces I think are neat.  Mostly to have the option to turn the kitchen from viking to 14th century England to Renaissance Spain depending on the theme of the dinner.  There is cast iron cookware, but I try to find pieces that look like period iron cookware. uploads/213/59048_103603933036638_100001610940794_24304_1916435_n1.jpg



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