As seen in magazine As seen in magazine from Great Paint Finishes for a Gorgeous Home copyright 1998 by Gary Lord. Mix baby powder fifty-fifty with blue chalk in your chalk box.
Chalk marks are easier to remove later.
If you wish to have your colors soak into the Aquastone more fully and to be more translucent, you can add up to 30 percent water to the Aquacreme. When tearing tape, apply the tape to the wall first and then tear the edges on both sides of the tape to create your ragged grout line. For a more free-form approach to your block, you can trowel on the Aquastone and create the blocks with no tape for the grout. Remove tape while stone is still wet but a little tacked up, anywhere from one-half to one hour depending on drying conditions. I used Off-White for this job.