Dear Mike,
I finally figured out how to use the computer to tell differences in colour. The following is superficial, but is certainly encouraging...
I tested the blue beneath the price tablet, beneath the crown, and on the side of the king's nose, plotting each probe, so there are four spots for each of the three locations. The two blocks are different - slightly.
I then checked the percentage of yellow showing at each of the three points.. below the price - the left side block shows 13 to 14% yellow on the side of the nose, 6 to 9% yellow below the crown, and 1 to 6% below the price.
In comparison, the right side block shows 19 to 21% yellow on the side of the nose, 12 to 16% below the crown, and 10 to 14% below the price. This seems to support the dealer's claim for a touch more yellow in the ink, and the sobriquet "Golden Blue". But...
Thankfully the two pieces you showed are marginal, and I was able to take three good tests of colour of the paper from each. Ready? The block on the left, which consistently showed less yellow in the stamp, showed variable yellow - of 24 to 25%. The golden blue block showed a solid and even 28% yellow in the paper.
I can draw the plotting and give you all the data if it's a help, just email me your address off-site:
So whatever the reason, your golden blue block is genuinely slightly different!
Best wishes,
Robin
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