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It may surprise you just how many uses these mixing trays have. They're perfect for color mixing; challenge students to make as many colors as they can from red, yellow, and blue colored water. (see photo) Discover various color reactions of acids and bases using a universal indicator. Use for mixing up small amounts of liquids, sprouting small seeds, or storing small items. Trays measure 13 cm X 9 cm with 12 wells. Each well is approx 1.5 cm deep and 2.3 cm wide. Tray lids are included. Also available in a 24-well version.