Baking process is just hot enough to evaporate water efficiently. Must be determined by trial and error experimentation.If you use the process above, you could use any water soluble ingredient, come to think of it, even parabens.The typical commercial pressed powder process produces thousands of pieces an hour, or more. The original slurry processes all tried to match that speed, so that the water in the slurry was essentially vacuumed away - and with it went all the parabens and other water soluble ingredients. The costs involved with the slurry process killed this technology for about 20-30 years - until the "baked makeup" process came along. That disk they are putting in below the slurry is the key to solving all the slurry problems we used to have, by the way. Very high tech stuff.
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