On the inside of the Envelope to open when one’s in trouble sold at the TasteView (19 Dec 2018-21 Apr 2019, Taste House), there are various combinations of two colors among all twenty colors. The two colors are superimposed on each other by 12 millimeters, so you can see how the two colors look when mixed.

When it is difficult to specify a spot color for a catalog, a leaflet, or a poster,
When it is difficult to determine the combination of paint colors to be painted on the wall,
Just when you’re in trouble,
Tear off the envelopes to check the color.