The substance to be examined is clear (2.2.1) and not more intensely coloured (2.2.2, Method II) than 20 mL of a mixture of 0.25 mL of The substance to be examined is clear (2.2.1) and not more intensely coloured (2.2.2, Method II) than 20 mL of a mixture of 0.25 mL of blue primary solution, 0.25 mL of red primary solution, 0.8 mL of yellow primary solution, and 18.7 mL of a solution prepared by diluting 4.0 mL of hydrochloric acid R1 to 100.0 mL with water