Can Beth and Beth be called Beth?

I don't think so. White silk should be said to be made of white silk, or directly called white silk. I don't know if trade terms are ok.

As far as I know, white silk can be divided into raw silk and cooked silk. It's not bad to say it's white silk, but I think it's wrong to call it white silk with silk!

Well, the conclusion is that white silk can't be called white silk unless it is abbreviated, but the ambiguity is a bit heavy.