This question is in progress and shall complete in 1 day, then check.
Jun 1st, 2015
In thinking about changes in the appearance of paintings, we may be inclined to think exclusively of later changes, changes following the completion of a painting by the original artist and his workshop. But I should like to draw attention to the facts that, first, the most important changes in the appearance of paintings take place during their original
creation, second, that there may be several different stages at which a painting may be said to have been finished by the original artist, and, third, that some of the physical changes following the so-called "completion" by the original artist may have been anticipated, accommodated for, even intended by the original artist.