When working in lower levels, up to level 4, you are able to intensify the perceived depth of your chosen level without dropping to a lower level by adding 1/8 oz of level 1N to your 2 oz formula. Keep in mind that this level 1N is very concentrated at the lowest end of the color spectrum and can have a strong influence on the outcome of the service. To add over 1/8 oz to a 2 oz formula may cause you to drop a level, so it is recommended that you are conservative in your formulations.
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