Leaving no stone of noobishness unturned, I have to ask: What is butterscotch?
Does it refer to a particular material, or just the color?
Does it refer to a particular material, or just the color?
Strictly speaking, the purists would argue that the "true" butterscotch brushes are the ones made from catalin, a cast (as opposed to molded) phenolic plastic.
The butterscotch colour is caused by the phenolic resin itself chemically converting to phenyl alcohol through the action of ultraviolet light.
Anything else is orange plastic.