Differnce in Blue from 19-2 to 19-3?

SEG

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What changed in the blueing process from a Model 19-2 to a 19-3, or is it just my eyes.
It seems to me that from -3 on the blue wasn't as deep. what did they change?
 
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What changed in the blueing process from a Model 19-2 to a 19-3, or is it just my eyes.
It seems to me that from -3 on the blue wasn't as deep. what did they change?
 
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