Chromacryl Mediums make painting with Chromacryl Students Acrylic even more versatile for students and hobby artists. They are used with acrylic paint to manipulate the consistency and properties of paint for an infinite variety of applications and techniques, whether it be screen printing, paper-mache, textile painting or glass paint. Chromacryl Mediums are an essential complement to your painting process and are AP-approved non-toxic.