CMC stands for carboxymethyl cellulose. It's a fine powder that makes the sugar paste thicker/firmer (the formed parts hold the shape better) and speeds-up the drying time. Other names for CMC are tylose powder and tylo powder.

CMC is NOT the same thing as gum tragacanth. CMC is a synthetic substitute for gum tragacanth. CMC works quicker than gum tragacanth, so you don't have to wait many hours for the paste to get thicker/firmer.
The thickness of the paste with added CMC will change during modelling:
  • Right after adding the CMC, the paste will be quite soft and easy to model.
  • During modelling it will get slightly firmer.
  • When you finish forming the part, it will be quite firm (or at least it will hold the shape well and will get firmer over a short period of time).

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