Formulation Chart
Any total formulation of color
PLUS developer/peroxide
together equaling = :

color + developer = 2 oz. add 10 drops
color + developer = 3 oz. add 13 drops
color + developer = 4 oz. add 17 drops
color + developer = 6 oz. add 22-25 drops

Example:
2 oz. color + 2 oz. developer = 4 oz. add 17 drops
3 oz. color + 1 oz. developer = 4 oz. add 17 drops

*Formula Adjustments can be made as needed
foil/bleach/hi-lifts add 17-20 drops
For shortage and re-mixing
add 5 extra drops

TCA
Formulations

Metric Conversion
metric to ounces
 30 ml = 1 oz
60 ml  = 2 oz
90 ml  = 3 oz
120 ml = 4 oz
150 ml = 5 oz
180 ml = 6 oz
210 ml = 7 oz
240 ml = 8 oz