It's actually a bit more complicated. :) They made vessels from copper when they could - copper is a superb heat conductor. But copper gets toxic fast when you cook acidic food. It gets worse if you don't clean your copper vessels. Wikipedia tells:
Copper is reactive with acidic foods which can result in corrosion, the byproducts of which can foment copper toxicity. In certain circumstances, however, unlined copper is recommended and safe, for instance in the preparation of meringue, where copper ions prompt proteins to denature (unfold) and enable stronger protein bonds across the sulfur contained in egg whites. Unlined copper is also used in the making of preserves, jams and jellies.
Despite not having adequate chemistry or medicine, people in old times had a clue - they saw that copper sometimes fouled and turned green, and suspected this was not good, preferring tin-lined copper vessels as the economical alternative to silver-lined copper vessels.
(Needless to say, industries of that time didn't produce stainless steel - maybe some alchemist blacksmith knew enough to make it, but it was not a thing.)
Lining copper pots and pans prevents copper from contact with acidic foods. The most popular lining types are tin, stainless steel, nickel and silver.
...but the chemistry of the time being what it was - shoddy - sometimes tin was contaminated with lead (Pb), sometimes it was deliberately adulterated with lead, and shit happened.
In the middle ages, guilds had a system of proof marks and inspectors to ensure craftsmen wouldn't add too much lead to tin alloys. The Nuremberg standard for example specified 1 part of lead against 10 parts of tin, but in Luzern, Switzerland, a problematic alloy was used.
As for Romans...
However, the use of leaden cookware, though popular, was not the general standard of use. Copper cookware was used far more generally and no indication exists as to how often sapa was added or in what quantity. (Grape syrup)
I think microplastics are going to be what wipes out humanity, not climate change.
You'd be wrong but it's a hopeful thought.
Chemicals in microplastics cause fertility issues. Humanity can survive the climate crisis for a very long time, but only if we can make new humans.
Nah, it's just going to make the people who survive climate change that much more miserable.
thanks to oil companies, the two are inextricably intertwined
Well we're about to hit a point of no return on the ladder there and it's been pretty quiet on microplastics. Haven't heard of people dying or even getting sick from them really.
I didn't mean that they would directly kill us.
The chemicals in plastic can cause reproductive issues, and there has already been a statistically significant decline in both testosterone levels and sperm health in men since they entered widespread use.
As plastics continue to degrade, we'll start to see the amount of microplastics in our bodies increase. And the production of those microplastics isn't stopping any time soon.
Humanity can survive the climate crisis for quite a long while, but only if we can keep making new humans.
Wait until you hear about the US's lead-based water pipe problem
Everyone get ready for the Hun invasion
