take 10g of paint and extract with successive portions of a suitable solvent until the residue is free from vehicle
1 take 10g of paint and extract with successive portions of a suitable solvent until the residue is free from vehicle
2 take 0.5g of dry residue and boil for 5 minutes with 50mL of 20%, acetic acid containing 5.0g of ammonium acetate, then cool, centrifuge, decant off the supernatant liquid, and wash the residue with 50mL of 20% acetic acid
3 treat the residue with 50mL of 1:2 hydrochloric acid, boil, cool, centrifuge, decant, and wash with 50mL of 1:2 hydrochloric acid
4 treat the residue with 25mL of concentrated sulphuric acid containing 5g of sodium sulphate, then heat to fuming, cool, centrifuge, decant, and wash with 25mL of concentrated sulphuric acid, decant and wash with 25mL of water
5 boil the residue for 5 minutes with 50mL of 10% sodium carbonate, cool, centrifuge, decant, and wash with 50mL of 1:10 hydrochloric acid
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