Doctor blade and doctor blade flaws
Posted: Thu Oct 14, 2010 7:00 pm
Dear All,
On a current thread on booklets there are two apparently totally conflicting statements - from people who know their stamps very well. I hope they'll forgive me paraphrasing:
1. Those vertical ink lines that pop up now and then on pieces, blocks, etc., are (and are invariably referred to as) doctor blade flaws.
2. If the line is vertical it cannot be a doctor blade flaw. These flaws are sloping or slanted because the blade wipes the cylinde sideways as it rotates.
Could somebody please explain exactly what the doctor blade does, and which of these statements is correct? There must be a LOT of dealers misdescribing choice blocks, and a lot of misguided write-ups one way or the other.
Or are they both right?
Thanks a ton, Robin R.
On a current thread on booklets there are two apparently totally conflicting statements - from people who know their stamps very well. I hope they'll forgive me paraphrasing:
1. Those vertical ink lines that pop up now and then on pieces, blocks, etc., are (and are invariably referred to as) doctor blade flaws.
2. If the line is vertical it cannot be a doctor blade flaw. These flaws are sloping or slanted because the blade wipes the cylinde sideways as it rotates.
Could somebody please explain exactly what the doctor blade does, and which of these statements is correct? There must be a LOT of dealers misdescribing choice blocks, and a lot of misguided write-ups one way or the other.
Or are they both right?
Thanks a ton, Robin R.