I bought 1 gallon of June Day Behr paint (1 quart wouldn't have been enough because it took 3 coats to cover the dark finish) I turned it into chalk paint by adding a tablespoon of unsanded grout mixed with a bit of water for every cup of paint I used. (craftingintherain.com)
I recently painted my kitchen cabinets with a red chalk paint that I made with unsanded grout, and valspar signitire pose red, distressed and touched with a bit of black. (athomewiththebarkers.com)
I have seen homemade recipes using unsanded grout so I got some of that to add to a flat white I have on hand. (domesticimperfection.com)