Learning Resources Primary Science Color Mixing LensesObserve the world while experimenting with colors! Place up to 3 interchangeable, primary color lenses into the frame to create secondary colors and hours of sensory fun! Hand held frame is sized for small hands Observe the world while experimenting with colors! Place up to 3 interchangeable, primary color lenses into the frame to create secondary colors and hours of sensory fun! Includes 1 sturdy lens frame (with 3 slots) and 3 colored lenses (red,