- Handy dispensers allow for quick access
- All Test Papers measure 6mm wide x 5m long
Litmus Blue (No. 53297) and
Litmus Red (No. 53298) test for acid or alkaline reaction. Change occurs around pH 5–8.
Congo Red (No. 53299) test paper changes color from blue to red in the range pH 3-5. Determines neutralization point in strong acid/weak alkali reactions. Use
Phenolphthalein (No. 53300) to determine neutralization point in k acid/strong alkali reactions. This white test paper changes to pink at pH 8.3 and becomes red at pH 10. Use
Lead Acetate (No. 53301) for detecting hydrogen sulfide. This rapid qualitative test paper, when wet with distilled water, can detect as little as 5 ppm in the atmosphere or in a gas stream. Pre-blacken this paper in hydrogen sulfide and you can check for hydrogen peroxide concentrations as low as 4 ppm. Use
Starch Iodide (No. 53302) test paper for detecting chlorine and other oxidizing agents. In acid solution, oxidizing agents react with the iodide in the test paper to liberate iodine. Turns blue in the presence of an oxidizing agent.
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