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By A. G. Fishburn

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The drawbacks are: (i) The excessive use of (a) leads to reliance on colour for absolute identification (as opposed to distinction) with the result that labels are not read. Unless a national colourcode is observed, a situation may arise in which the same colour has totally different meanings in two hospitals and 61 62 AN INTRODUCTION TO PHARMACEUTICAL FORMULATION confusion is caused, for example, when nursing staff move from the one to the other, (ii) Bearing in mind the limitations of colour vision in some individuals and the possible fading of colours on storage, there is only a relatively small range of colours which can be used.

The main types used in pharmacy and medicine are the quaternary ammonium salts, of general formula : R R 2\ i >N+ + X' V I R4 where Ra 2 3 4 are alphyl or aryl. g. the pyridinium compounds); X is usually chloride or bromide. As already pointed out, these compounds are usually bactericidal and the majority are, in fact, used as antiseptic drugs rather than as excipients. P. C. P. P. P. P. CH2N >N+ (Br', Cl') CH/ | CH 3 The aliphatic chain is conventionally expressed as C 13 H 27 but is actually a mixture ranging from C g to C lg .

Methyl salicylate. P. P. Wool Alcohols comprises the free alcohol, or sterol, fraction of wool fat which represents about 50 per cent of the total unsaponifiable matter. P. m i n i m u m 30 per cent), the remainder consisting of lanosterol (about 25 per cent) and various other sterols and alcohols. Wool Alcohols has a much higher melting point than Wool Fat and is more waxy in appearance. P. P. P. Oily Cream (Hydrous Ointment) is the basis for Salicylic Acid and Sulphur O i n t m e n t B . P . P.

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