Also the cartouch block seems to have been painted with whitewash or thinned out white plaster.. It's damn near pure white, the adjacent blocks are light "yellow ochre".
Also some of the whitewash seems to have abraded off under the chisel, exposing the true block colour. The whitewash does not seem to be applied the lower left corner of the said block..
Basically I'm trying to figure out from the Dowell photos if this block has been whitewashed or not ..