Found this:

Has my stevioside been bleached?

Stevioside that is paper white has been bleached with chemicals. Pure Stevioside should exhibit a natural creamy, off-white color. Be careful and always ask because some companies will use color additives to make their stevioside look like natural stevioside.

Isn't your SweetLeaf powder off white? I haven't used it in a while

Sweetleaf website:

http://www.wisdomherbs.com/products...via_extract.htm

Hmmmm?