Denatured alcohol in CA.

[DoogMeister]

have only used 91% isopropyl alcohol with good results.

[Eirewolf]

Thanks so much everyone! I will try the isopropyl alcohol.

If anyone else has experience using it to cut dyes (or has more suggestions for other alternatives), I'd love to hear about it!

[bruce johnson]

I never used anything but isopropyl rubbing alcohol for thinning dyes. It is dirt cheap and available at every corner drug store. When I was doing leather a bunch, I'd buy it by the gallon. I never saw a difference between the rubbing alcohol and higher percentages with my dye formulas. 

[cord1974]

I think it was Aaron from Makers who said Peter Main uses rubbing alcohol as a dye reducer.

I've used it in the past as well denatured alcohol. I can't tell any difference.