We supply four colors of standard resin: clear, white, grey, and black. In addition, we have three speciality resins:

Tough resin, which is blue in color and incredibly rugged and shatter-resistant: http://formlabs.com/products/materials/tough/Flexible resin, which is dark grey in color and very versatile: http://formlabs.com/products/materials/flexible/Durable resin, which is transparent and has ductile as well as high-impact strength: https://formlabs.com/materials/engineering/#durable