This Nicholsons Peerless Watercolor Bonus Pak contains 40 pages of a heavy film coated with highly concentrated pure color of intense strength and absolute solubility. Color readily discharges when it comes in contact with water. Each sheet measures 2.5 x 6.5. Originally developed in Rochester, NY for hand tinting black & white photos. Mottled surfaces are a normal result of the handmade process and do not affect performance.