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Proper mixing and usage directions for haircolor products are typically found on:

  1. Haircolor chart

  2. Manufacturer's box

  3. SDS

  4. Salon manual

The correct answer is: Manufacturer's box

Haircolor charts are typically used to show examples of different colors and are not typically used to provide instructions on usage. SDS (Safety Data Sheets) provide information about the chemical ingredients and safety precautions but do not include usage directions. Salon manuals may have general guidelines on haircoloring but not specific directions for particular products. The manufacturer's box is the best place to find proper mixing and usage directions for haircolor products as it is directly from the manufacturer and specific to the product in question.