Looking in the flat area between the I and V of GEORGIVS,
there is no blue!.
On the left coin the rgb values are 207/154/56 for instance and on the right
coin the colors are 144/85/0.
Checking around in the coin flat area on the right coin shows no blue
anywhere. There is some blue in the highlights however so
it is not turned off entirely just truncated .
Whatever is processing your scan is truncating your blue in the
Most scanners have some feature to correct for 'white'. You might use a
dropper icon to select a point that should be white or at least grey.
You might find it helpful to place a white dot of paper somewhere in the
scan that you could tell your scanner is 'white'.
(could your plastic case you are scanning thru absorb 'blue' i.e UV