The Grow Colossal Crystals kit teaches children to make their own large, red and clear crystals using the scientific method and a few simple ingredients. The kit includes clear monoammonium phosphate, red monoammonium phosphate, one piece of thread, two stir sticks, one small cup, two large cups, a measuring beaker, and a "science guide." The kits has enough materials to create nearly a pound of crystals.

Although there are many crystal-growing kits available, our reviewers remarked on the variety of crystals that can be made as well as the well-written, age-appropriate "Science Guide." The guide includes instructions for creating crystals as well as explanations of solids and solutions, several "How Does It Work" sections, and suggestions for additional crystal-growing projects.