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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 different colors from red, yellow, and blue colored water as they can. Discover the many various color reactions of acids and bases using a universal indicator. Use for mixing up small amounts of liquids, sprouting seeds, or storing small items. Trays measure 13 cm X 9 cm with 24 wells. Each well is approx 1.5 cm deep and 1.5 cm wide. Tray lids are included. Also available in a 12-well version. Sold individually.