It's important to note that this is not a common name for anything specific. "Weisse Masse" literally translates to "white mass" and could refer to a variety of things, depending on the context.
For example, it could refer to:
* A type of white paint or plaster
* A white powder or substance
* A white food product
If you have more information about the context where you encountered the name "Weisse Masse," it would be easier to determine what it specifically refers to.