M 105
Work has also been done on the application of direct colour photography to the recording of results of colour tests in toxicological investigations and to other laboratory colour tests. The results so far obtained indicate that this method will prove of very considerable value.
During the year the Police have submitted a number of documents on which invisible secret writing was suspected. Work was done on suitable methods of development and on modifications of existing methods for this work. The ultraviolet light method will be adopted for this work as soon as the necessary apparatus is obtainable.
Methods for the determination of alcohol in urine in cases of alleged drunkenness have been proposed in England and these have been tested out in the Laboratory. Special methods of determination are required in this work owing to the minute quantities of alcohol concerned.
The services of the Laboratory were requested in connection with the corrosion of condenser tubes in a local refrigeration plant. In this connection work was done on the corrosive action of the Hong Kong harbour water on iron and steel in addition to a micrographic examination of the corroded tubes.
Extensive investigations have been carried out on China wood oil. Conditions affecting results given by the proposed Bolton & Williams Heat Test have been investigated and a new procedure is being tested by means of which it is hoped that adulteration with foreign oils in as small a proportion as 1 per cent may be detected with certainty.
SAMPLING
The following Table shows the amount of sampling carried out by the Government Sampler during the year:
Substances 1930 1929 Tin Wolfram 2,439 tons 4,119 tons Manganese ore 149,700 tons 91 Bismuth ore None - Molybdenite 19 bags 364 Copper coins None 2,185 lbs Lard 38,115 cases 16,145 cases Wood oil 260 tons 465 tons Paraffin wax None 107 bags Anise oil None 8,000 lbs Cassia Oil 5,920 lbs - Peanut oil 40 tons 5,209 lbs Tea seed oil None - Glycerine 210 lbs None Portland cement 770 lbs 80 tonsM 105
Work has also been done on the application of direct colour photography to the recording of results of colour tests in toxicological investigations and to other laboratory colour tests. The results so far obtained indicate that this method will prove of very considerable value.
During the year the Police have submitted a number of documents on which invisible secret writing was suspected. Work was done on suitable methods of development and on modifications of existing methods for this work. The ultraviolet light method will be adopted for this work as soon as the necessary apparatus is obtainable.
Methods for the determination of alcohol in urine in cases of alleged drunkeness have been proposed in England and these have been tested out in the Laboratory. Special methods of determination are required in this work owing to the minute quantities of alcohol concerned.
The services of the Laboratory were requested in connection with the corrosion of condenser tubes in a local refrigeration plant. In this connection work was done on the corrosive action of the Hong Kong harbour water on iron and steel in addition to a micrographic examination of the corroded tubes..
Extensive investigations have been carried out on China wood oil. Conditions affecting results given by the proposed Bolton & Williams Heat Test have been investigated and a new procedure is being tested by means of which it is hoped that adulteration with foreign oils in as small a proportion as 1 per cent may be detected with certainty.
SAMPLING.
The following Table shows the amount of sampling carried out by the Government Sampler during the year:-
Substances,
1930.
1929.
Tin Wolfram
Manganese ore
Bismuth ore
2,439 tons.
149 700 tons. None.
4,119 tons.
91
Molybdenite
Copper coins
19 bags. None.
364 None. 2,185 lbs. None.
51 tons.
Lard
38.115 cases
16,145 cases
Wood oil
260 tons.
465 tons.
Paraffin wax
Nonc.
107 bags.
Anise oil
None.
8.000 lbs.
Cassia Oil
5,920 lbs.
Peanut oil
40 tons.
5,209 lbs. None.
Tea seed oil
None.
Glycerine
210 lbs.
None.
Portland cement
None.
80 tons.
770 lbs.
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