6. How is the color of liquids determined? Which solution should be considered colorless? Give the formulas and names of salts used to prepare ethanols of brown, yellow, pink and green shades. Which solution should be considered transparent? What substances are used as standards to determine the degree of transparency and degree of turbidity of solutions of pharmaceutical substances according to GF? Under what conditions are the clarity and turbidity of liquids tested? How is the degree of turbidity of colored liquids determined?

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