EEEeek!

       I do NOT claim, NOR have I EVER claimed to know the entire Lexicon of Britain, let alone the English speaking world, after all I only scraped a 65% in Eng Lang, compared to my 45% for Eng Lit. (The complete converse of my expectations.) - BUT - that said, I'm still rocked back at a new word which has taken 82.6667 years to impinge on the old consciousness; particularly in THIS context.
       I was doubly thrown to find the word repeated in the article.  Initially I was all set up to yell "Shoot the Proof-Reader!" when the word did not appear to exist - THEN then, realising I'd misspelt it, a second search revealed this:-
"Collagraphy (sometimes spelled collography) is a printmaking process in which materials are glued or sealed to a rigid substrate (such as paperboard or wood) to create a plate.  Once inked, the plate becomes a tool for imprinting the design onto paper or another medium. The resulting print is termed a collagraph."
        As we, from time to time hear - "WHO KNEW?"  ;¬ )