50 JOURNAL OF THE SOCIETY OF COSMETIC CHEMISTS SOCIETY OF COSMETIC CHEMISTS OF GREAT BRITAIN Third Year Diploma Examination BRUNEL COLLEGE PAPER I (Monday, 23rd June 1958) Candidates must answer Question I and any FOUR other questions. Do not attempt to answer more than five questions, including Question 1. Candidates should commence each question on a separate sheet of paper. 1. Describe a method of testing for compatibility between preservatives and emulsifiers. Give details of the apparatus required and the test organisms which should be used. 2. Write short notes on the association between bacteria and the following :-- (a) Body odour. (b) Acne. (c) Dandruff. (d) Dental caries. 3. Write an account of the various binding (gelling) agents which are used in the formulation of toothpaste. 4. Discuss the most important properties of an emulsifier designed to produce O/W emulsions. 5. What are the principal requirements of a nail lacquer and how can these requirements be achieved ? 6. Give details of the manufacture of (a) Toilet soap. (b) Lather shaving cream. Give a list of the necessary control tests for each of these finished products. 7. Discuss the three most important halogenated hydrocarbon propellants employed in pressurised packs. Indicate their structural formula, vapour pressure and stability.

SOCIETY OF COSMETIC CHEMISTS OF GREAT BRITAIN 51 8. Comment on the suitability of a perfume containing the ingredients given below for use in (a) Brilliantine based on mineral oil (technical white oil). (b) Talcum powder. (c) White soap. Hydroxycitronellal, Geraniol, Geranyl acetate, Geranyl formate, Pheny, ethyl alcohol, Phenylacetaldehyde, Oil of Patchouli, Husk ambrettel Indol. PAPER II (Wednesday, 2•Sth June 1958) Candidates should answer any FIVE questions. Do not attempt to answer more than five questions. Candidates should commence each question on a separate sheet of paper. 1. Give the definitions of Acid Value, Saponification Value and Iodine Value. A sample of bleached beeswax was found to have an acid value of 12-1 and a saponification value of 55.1. 1-0 gm. of the sample was treated with an excess of Wij's reagent (iodine monochloride). After the addition of potassium iodide solution, the excess of free halogen was titrated against N/10 sodium thiosulphate solution and required 9.9 mls. A blank carried out on the same quantity of the reagents alone required 15.1 mls. N/10 sodium thiosulphate solution. Calculate the iodine value and the ratio number of this sample. Comment on the quality of the beeswax and its suitability for use in cosmetic preparations. The atomic weight of iodine is 126.9. 2. What raw materials are used in face powder formulations and why are such materials used ? 3. Give an account of the methods available for determination of particle size of fine powders. 4. Describe any tests which you consider necessary to ensure that a lipstick is satisfactory in use. 5. Hair dyes based on p-phenylene diamine are used in conjunction with hydrogen peroxide. Give the reasons for this and the equations for the chemical reactions between the two substances.