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Can I use Loreal 40 volume developer with Garnier Brown color? Do I mix them together or use them separately?
How do I do a strand test?
To do a strand test, mix a small amount of the developer and color together, then apply it to a small section of hair. Leave it on for the recommended amount of time, then rinse it off and check the color to see if it's what you wanted. If it looks good, then you can proceed with the full application.