On a few lucky occasions a first proof pulled from the press appears to be complete. But this is a rare occurrence because most often the print needs adjustments, further work, and several additional stages.
...While such a procedure is going on it is possible to see alternatives that suggest fresh directions and result in new prints. At other times the process... may make the artist feel utterly hopeless.
...learn to use the nerve of failure as a positive tool.
I think Thiebaud must be a good teacher.
This book includes a wide selection of hand colored prints, including ones that show drastic variation: drastic changes in color selection, lines added in, the same scene shifted from day to night.
At the end is a brief history of the hand colored print, by Robert Flynn Johnson.