Pour a bag of the concrete mix into a wheelbarrow. To mix the color, pour a half gallon of water into a bucket along with a pint of the color, then add one gallon of water and stir.
Add the color mix (Image 1 -- ash was used for this particular project) to the dry powder a little at a time. When the mix is ready, add it into the form.
Smooth it out with your hands and be sure to work out any large air bubbles.
Clip the wires off the form and then begin "screeding" (a smoothing process) the mixture, by sawing a board back and forth over the top (Image 2). Take a palm sander and vibrate the sides of the mold to get rid of air bubbles.
Take a magnesium float and go across the top of the mold to seal it and get rid of any bumps. Let the mold sit for 45 minutes to an hour for it to harden.
Note: It takes a full 28 days for concrete countertops to cure.