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(1) Crude pyridine should consist of pyridine bases, and should not be more deeply coloured than a mixture of 2 millilitres of deci-normal iodine with one litre of water.
(2) It should mix readily and completely with spirits and should give a clear or only slightly opalescent solution when mixed with twice its volume of water.
(3) 10 millilitres of a 1 per cent solution in water should produce immediately a distinct crystalline precipitate on vigorous shaking after the addition of 5 millilitres of an aqueous solution of cadmium chloride containing 5 grammes of the anhydrous fused salt in 100 millilitres and an abundant separation of crystals within ten minutes.
(4) A white precipitate should be formed when 10 millilitres of a 1 per cent solution in water are mixed with 5 millilitres of Nessler’s reagent.
(5) 1 millilitre of crude pyridine dissolved in 10 millilitres of distilled water should require not less than 9.5 millilitres of normal sulphuric acid for neutralisation, using Congo Red paper as indicator.
(6) 100 millilitres slowly heated under the conditions laid down for Benzol for Motor Fuel by the British Engineering Standards Association (B.S. Specification 2 D 15) should give a distillate of at least 50 millilitres at a temperature of 140 degrees C and of 90 millilitres at 160 degrees C.
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