Photographers" Formulary Residual Hypo Test is a simple chemical test that can be used to determine if a print or film strip has been adequately washed. * The test will give accurate results if the print or film has been treated with hypo clearing agent and washed in water or just washed in water * This test is reliable when used on either fiber or RC papers * The chemicals in this kit are mixed and ready-to-use with no further dilution needed * Used to test whether film or prints have been adequately washed. * Easy to read results * Economical to use