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10 Potentially Explosive Chemicals b. breathe on it 4 times each for 3-4 seconds For aqueous solutions: 1. Dip the test strip in the chemical for 1 second, such that the reaction zone is completely wetted. 2. Remove the test strip, shake off excess liquid and compare the reaction zone with the color scale after 15 seconds. Vendor information: • Sigma-Aldrich Catalog No. Z10, 168-0 (package of 100) • Fischer Scientific Catalog No. 91312 (package of 100) • Chemistry Stores NOTES: For aqueous solutions outside the pH range of 2-12, consult manufacturer’s instructions. If peroxide level is >100 ppm, do not dilute. Call EH&S or ESH to arrange for disposal. If test results are positive for any concentration of peroxides DO NOT DISTILL before treating the peroxides (see Appendix 3 for treatment methods).