This set of Stainless Steel spoons is invaluable when working with colour.
 
1 dash = approx 1/8th teaspoon
1 pinch = approx 1/16th teaspoon
1 smidgen = approx 1/32nd teaspoon
1 nip = approx 1/64th teaspoon
 
Please remember that if you are putting products through assessment you will need to weigh your ingredients instead of using the above measurements.