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As hunter stated. Zinc is only used in alloying for Brass - It, and carbon, currently (0.0.9e specifically) are smeltable but produce nothing alone, there are no items for them, either.

You need to put copper in and zinc in, in order for it to alloy into Brass.

And Iron, and Carbon, in, in order for it to alloy into Steel.

Bronze is, as result, definitely safer to screw up on, because if you don't follow the recipe, you might end up with components of the alloy in ingot form.

For example

1 copper in, and then 1 tin in, before the copper finishes, will make Bronze.

5 copper in, and then adding tin in over time before the copper finishes
Will result in maybe, one of them combining as bronze, while the rest will probably be Copper and Tin.

1 copper, 1 tin, 1 copper, 1 tin, 1 copper, 1 tin, 1 copper, 1 tin -> would result in all bronze, provided it is done, That way, Smelter on, 1 copper, 1 tin, waiting for it to be taken, and then repeat.

But ore or ingots of tin and copper, can make bronze, where as thin air from "carbon ingots" (which don't exist, thus thin air) can't be "tried again to make  alloy"