i use black RI all the time and i haven’t noticed it being chaulky. have you tried it recently? perhaps a different RI recipe is needed if you’ve had that problem in the past. just remember it will dry darker than when it is wet. you can check out my FB page and i have a cookie album if you want to take a look at some that i’ve used black on. i recently did some Batman and UGA (the big “G”) cookies that have a lot of black. hope this helps.