Richeson - Lock Box Palette 10 Well - Acrylic and Watercolor - The Lock Box is a fantastic palette that allows artists on the move to store and transport their paint. Teachers find it great for distributing paints to students in the classroom. The top of this unit locks in position with a secure slide fastener. Inside, paints can be stored in a circular plastic palette or on mixing paper. Also available is a plastic insert that will hold 6 round tempera cakes. ItÆs a perfect container for acrylics, watercolors, oils and gouache. With included wet sponge strips in place, paint wonöt dry out and can stay useable for weeks, helping to eliminate wasted paint.