According to the Epigraphic Survey’s documentation method, the data package for a regular wall section consists of the following items: archival photo(s), the drawing created on the photo enlargement, and the collation package.
Blueprints of the original artwork have always been essential to the Epigraphic Survey’s collation methodology. They are an exact reproduction of the original drawing, created by using a contact print process on light-sensitive sheets.
Once the collation is done and the epigraphers and the artist are all in agreement about the changes to be made to a drawing, the artist has to transfer all these modifications from the collation sheet to the computer.