Try This

[ken steel]

I recently did a kitchen tile job where we
couldn’t find the right shade of rose for the
grout. What we ended up doing was to buy three
different boxes of Polyblend and mixed them (we
used measuring tablespoons so we would know the
proportions when we mixed the big batch). We
glued some scrap tile to a board backing and
actually grouted them using the different
mixtures and were then able to look at them in
different light at different times of the day.
We ended up not using one of the colors, so there
was a few bucks wasted; but when you consider how
permanent grout is it was worth it. And the
result was perfect. Good Luck, Ken