Has anyone ever seen a pre-printed colour shikishi 
with pencil/sketch marks still underneath the colouring? 
Or are the original images for preprinted shikishi 
usually cleaned up before they're printed? Anyone 
have any good links about shikishi in general or know 
anything about anime/manga print shikishi standards? 

I'm asking because I would like to find out if a full-
colour, well-detailed shikishi I own (and always thought 
was either done by a doujinka or pre-printed) is actually 
an original or not. I've just translated the sweeping 
signature in kanji/hiragana only to discover that the 
signature is that of the series creator/mangaka. I 
suppose it could have been a charity auction piece or 
something... hence the time that seems to have been 
taken on it, but I'm not sure. Hmm... anyone? Thanks in 
advance!

/t.