So, completely unrelated to Cosmere work, I was doing some research into the nature of metallurgy, specifically carbon structures in steel, and came up with a problem that I haven't seen answered before.
It has been well established that allomantic alloys must have precise percentages in order to be effective. For true metallic alloys such as bronze, pewter, and brass, this is not a problem, as the alloy process involves combining the elements involved by heating the components to liquid form. But steel is a problem. Carbon does not liquefy, and often neither does the iron (depending on furnace technology) during the steel forging process. As such, carbon is not evenly distributed through the steel. In larger products, this is mostly irrelevant, as the distribution of the carbon crystal structures in the iron is even enough function. However, this idea falls apart when considering something as small as the metal flakes consumed by allomancers. Because steel is not fully liquefied like other alloys, these flakes cannot possibly have even distribution of carbon in them, and thus will not match the perfect ratio necessary for allomantic efficacy, or even safety as it is strongly implied and in some places stated outright that a bad alloy can kill an allomancer when they burn it.
Has this issue been addressed before and I just missed it? What are your thoughts on it? It seems a pretty large hole in one of the key rules of allomancy to have gone completely unnoticed, and I was quite surprised to not find anything on the topic.