Re: Waste mold casting
This process also be termed "life casting." Alginate is used for this type of casting as seen in the video and is water based. If the model surface to be molded is not human skin then a separating medium must be applied to the model surface otherwise the alginate will stick and tear with demolding. Waste molds can also be made of plaster and plaster can also be cast into the mold. With a thin pigmented surface layer on the casting, the mold is chiseled from it. Plaster molding is very time consuming and very messy!
Thank goodness for modern mold materials!