A couple of chalks I found today (Photo by Me)
Calcium sulfate, a.k.a. plaster, is the raw material from which our every-school-day chalk is made. It sounds a little obvious when you think about it, but how many of you reeeeeeeeeally knew it? I didn't!
Well, first you take that plaster and turn it into a powder with similar texture to wheat flour. Then, you mix it with water, pigments and other substances, making a paste that will dry in cylindrical molds for up to 20 days. Finally, you take'em out of the mold, cut and pack them. Done!
I wonder if it's possible to make the inverse process: turning chalk back to plaster. Hummmm...
Well, first you take that plaster and turn it into a powder with similar texture to wheat flour. Then, you mix it with water, pigments and other substances, making a paste that will dry in cylindrical molds for up to 20 days. Finally, you take'em out of the mold, cut and pack them. Done!
I wonder if it's possible to make the inverse process: turning chalk back to plaster. Hummmm...
~Ally
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