Should I decolorize slipcovers before dying?

Bj Blyth
by Bj Blyth
I have a sofa with slipcovers I can remove to wash. It's great except for the color! It's a baby poop dingy yellow canvas type material. I want to dye it a charcoal gray. Should I use decolorizer before I try to dye? Help! Any advice appreciated.

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