Free Sample Watercolor Paint Trays are available from Gamblin Conservation Colors. Samples consist of six dried colors in a watercolor tray. To use, rewet with the solvent you are currently using for retouching. To request a sample tray send an email to: [LINK INCOMPLETE] and include your complete mailing address. The six colors in the sample set are: Titanium White, Ivory Black, Cadmium Yellow Light, Cadmium Red Medium, Ultramarine Blue, and Burnt Umber.