The article examines the concepts of the following three quantities: p
artial colour sensitivity of a recipe to a particular colorant, colour
balance of a recipe, and the over-all colour sensitivity and the rela
ted property of colour robustness of a recipe. The way to calculate nu
merical estimates of the above quantities is extended from the case of
CIE La*b* to the case CMC(l:c) colour difference formula. Results of
a few numerical experiments are included for illustration and some po
ssible practical consequences are discussed. (C) 1995 John Wiley & Son
s, Inc.