Cabot's Bleaching Oil is their oil modified penetrating stain with a small amount of gray pigment and a mild bleaching agent that eventually turns the wood a silver color. White cedar naturally lightens in the sum but this gives it a head start.

If you want to make the Bleaching Oil darker or another shade of gray, you could add more pigment (ask a dealer to be sure this can be applied evenly) or use the more common method of mixing the Bleaching Oil with Cabot's Weathering Stain. I suspect the bleaching effect would be reduced but I guess it would still be noticeable.

I don't think mixing the Bleaching Oil with another Cabot Stain is recommended but you need to ask a Cabot dealer or contact the company.