Abstract: Objective To develop an economical and practical method by adjusting water color and turbidity for Morris water maze Methods Pigment was used to adjust the color and turbidity of the water by screening the suitable concentration and proportion. Results 10 mg/L white pigment was suitable for the requirenent of turbidity, 5 mg/L melanin for color, and the mixture of 10 mg/L white pigment and 5 mg/L melanin for the turbidity and color perfectly. Conclusion 10 mg/L white pigment could be used for Morris water maze tests in small pigmented rodents and the mixture of 10 mg/L white pigment and 5 mg/L melanin solution was suitable in the small albino rodents.

Key words: Experiment economics, Morris water maze, Colorant