Canada #435i 5c Bright Aniline Blue, Family and Star, 1964 Christmas Issue, a LL Field Stock Block of the Scarce Aniline Ink on Low Fluorescent Paper

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A very well centered and scarce lower left field stock block of the 5c bright blue family and star stamp from the 1964 Christmas Issue, printed in the scarce aniline ink on low fluorescent flecked paper.

The aniline inks are not listed in Unitrade, but they occur on many of the blue stamps of the 1950's and 1960's. They are all scarce, turning up only a handful of times in many hundreds of mint examples, and quite often thousands of stamps. It has been suggested by some that these are colour changelings brought about by storage conditions, but I have recently sold a cover that was franked with several stamps, with only a few on the envelope being aniline. This supports the notion that these are legitimate differences in the chemical composition of the inks. On this issue the blue is actually a completely different shade from what is usually seen. Normally this stamp is printed in a deep ultramarine, or a violet blue. This shade is much brighter. Also, the comparison scan of the backs shows the suffusion of colour through to the surface of the paper that is characteristic of stamps printed with aniline inks. 

Unitrade does not list these printings, but my estimate of their value is generally between $25 and $50 per stamp. So for this corner block on the scarcer fluorescent paper, I would place the value at $125 for the block. The block offered here grades 84 as follows:

Centering/margins: 54/70 
Paper freshness: 5/5 
Colour: 5/5 
Impression: 5/5 
Absence of visible paper flaws: 5/5 
Perforations: 10/10

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