color-key

Then, if the shade has been pretty even, and your canvas has had a fair light, you will get a fairly good color-key.

Throughout the 'Color Key,' therefore, alterations should be made when required by these two changes in method.

The modern manuals, too, are usually furnished with a color key, the use of which is fully explained in them.

It has a color key and a color chart, by which one may see what is meant by colors named.

These changes affect all similar cases throughout the Color Key.