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thanks Paul for that, i will look at it late night. i have created an excel to do that. does anyone know how should I think of finding the perfect mix of shades to match tooth shade? not close but precise. here is what i mean:

my shades got color picked values like:

A1

L=73

a=4

b=21

A2

L=78

a=9

b=24

if i color pick a tooth and Lab values are L=74 a=8 b=22 how should I look for the mixture like 70%A1 + 30%A2? are those values equal during calculation or should i only think about a and b?