Question

4. How can you tell if two different brands of pens use the same combination of dyes to make black, blue, or another color?​

Answer 1

Answer:

Paper chromatography can be applied to ink to determine if it is a pure substance or a mixture of pure substances (in which two or more pure substances are combined). Since, when tested with paper chromatography, ink separates into its constituent pure substances, ink is a mixture.

Explanation:

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