decolorant
decolorizer
decolouriser BrE

You will need to try this "in the lab" to dial in how much color and decolorizer is needed.

Cerium compounds are also used in the manufacture of glass, both as a component and as a decolorizer.

When a decolorizer such as alcohol or acetone is added, it interacts with the lipids of the cell membrane.

It colors glass violet, and is used as a decolorizer to remove the green tint of impure glass.

Dorners method (acid alcohol decolorizer) without the Schaeffer-Fulton modification (decolorize by water)

When mixed with molten glass it oxidizes the ferrous iron to ferric iron, and so discharges the green and brown tints (making it classically useful to glassmakers as a decolorizer).