Put a paint or solvent that you want to toned on a paint dish and adjust it to the color of your choice with a brush or a mix stick. You can use it not only for paint but also for mixing adhesive and putty materials.
The product material is made of polypropylene (PP) that does not easily adhere paint. Paints that have dried out can also be removed by peeling them off the paint tray with adhesive tape or the like. If it can not be removed completely, wipe it with a solvent dedicated to that paint.