Bonus 1 — Unwanted Tone Neutralizing Chart

When your strand test doesn't give the shade you expected, you can almost always fix it with a toner or a neutralizing tone instead of repeating the whole process. This chart uses the color wheel (opposite tones cancel each other out).

Bonus 1 of the guide "12 At-Home Hair Color Formulas": 4 pages in PDF. You can buy it on its own, or get it included in the bundle with the guide and both bonuses.