According to Drew, industry practice now involves detailed notes of the materials and techniques used to restore a piece.
The hope is that these notes will stay with the painting into its new life for years to come.
Sometimes it is a faulty repair, like in the painting Drew is working on, or sometimes the material simply ages poorly.
"[People] would use materials that would change differently from the original materials because they weren't thinking about reversibility, they could be quite difficult to remove," Khandekar said.
"Now, we want to use things that stay soluble that can be easily taken off without damaging or changing the original material."
Persons:
Drew, conservators, Khandekar