Bill;
There are several different reducing agents on the market.
We have one that is a powder, with a mild odor, and the exact pH for wool (5.5).
It is our Dynachem Fiber Brite.
It can be added to our neutral encap for color enhancement & cleaning boost.
It is also used to remove "yellow" stains (urine, coffee etc.) from wool rugs.
Larry Cobb