สารบัญ

Category  Counter-irritant; pharmaceutic aid; antipruritic.

        Camphor Spirit contains, in each 100 mL, not less than 9.0 g and not more than 11.0 g of camphor (C₁₀H₁₆O).
         Camphor Spirit may be prepared as follows.
        Camphor, Racemic or Natural 100 g
        Ethanol, sufficient to produce          1000 mL
        Dissolve Camphor in 800 mL of Ethanol, and add sufficient Ethanol to bring to final volume.  Filter, if necessary.

Strength available  10 per cent w/v. 

Dose  Adults:  Topical, to the affected area, not more than three or four times a day.

Ethanol content  80.0 to 87.0 per cent v/v (Method II, Appendix 6.5).

Assay
  Assay preparation Pipette 2.0 mL of Camphor Spirit to a suitable pressure bottle containing 50 mL of freshly prepared dinitrophenylhydrazine TS.  
 Procedure  Close the pressure bottle, immerse it in a water-bath, and maintain at about 75° for 16 hours.  Cool to room temperature, and transfer the contents to a beaker with the aid of 100 mL of 3M sulfuric acid.  Allow to stand at room temperature for not less than 12 hours, transfer the precipitate to a tared filter crucible, and wash with 100 mL of 3M sulfuric acid followed by 75 mL of cold water in divided portions.  Continue the suction until the excess water is removed, dry the crucible and precipitate at 80° for 2 hours, cool, and weigh.  The weight of the precipitate so obtained, multiplied by 0.4581, represents the weight of camphor (C₁₀H₁₆O) in the portion taken.

Other requirements  Complies with the requirements described under “Spirits” (Appendix 1.16).