...he used 17th Century canvasses for his forgeries?
He scraped the paint off, then used fresh paint, made the way they did in the 17th Century.
A portrayel of a Vermeer, Frans Hals, or other master was painted and signed.
The painting was placed in an oven and then rolled onto a rod to create the crackelled effect.
The cracks were then rubbed with black ink (to accentuate the cracks).
In this manner a 17th Century painting was produced in the 20th Century.
