• British Pharmacopoeia Volume V
  • Appendices
  • Appendix I A. General Reagents

Naphthalenediol Solution
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Naphthalenediol Solution 2,7-Dihydroxynaphthalene solution.

Dissolve 10 mg of 2,7-dihydroxynaphthalene in 100 mL of sulfuric acid and allow to stand until decolorised.

Use within 2 days.