With over 54 years of experience, Alvin is one of the primary sources for drafting supplies and drawing equipment in the country. Together with this core group of products, we continue to meet the needs our customers with our expanding range of fine art, hobby and craft supplies, our large selection of drawing room furniture, and our wide assortment of exclusively-designed products. Smooth rich paint made from finely ground pigments can be thinned with water or thickened with mediums for different effects. 24 rich vibrant colors. Sold as a box of three. Transparency rating - T=transparent ST=semitransparent O-opaque SO=semi-opaque.