One of the first serious “lab” projects I did with clay – what I call the educational, learn my medium tasks – was make colour chips from the brands I was using. At the time, that was Fimo Classic and Premo! I made a lot of colour chips and variations on the hues as well. These days I work mostly with Premo and, even if the colours have changed a little over the years (I’m looking at you turquoise!), I still refer to those colour chips.
Turns out that Sculpey publishes lots of colour mixes from enthusiastic (and super talented) clayer Syndee Holt. Her latest one picks tones from a Venetian scene and talks about how to mix white and ecru to get a good lightening effect that isn’t as white as straight white and not yellowing. When I did my chips I ran into the same issue and did one tint of each colour with “beach” which was half ecru, half white.