Speaking of glazes being 'cleaned off' over time, I just finished a book on painting conservation by Keck (written in 1965) where she mentions a few cases of this very thing. And while reading it, I began to wonder, what do you pros do to ensure that your relatively few glazed passages are not 'cleaned off' in the future?
Here's my problem: I have developed a habit of glazing Alizarin over a portrait to appropriately redden checks, noses, or ears, in addition to glazing clothing and sometimes shadows on the face. Since these glazes will be the very last layers of color within the portrait, how could one best ensure that a future cleaning wouldn't remove these passages when the varnish is stripped off and re-applied?
What do you guys do?
Minh Thong
(For the record, I'm quite sure I have not yet painted anything that will be around long enough to need cleaning. However, I'm still curious because I stubbornly cling to the hope of finding a teacher before I'm so old my eyesight is gone and I am forced to explore scultpure.
)