Canada #1159 6c Red Fox 1988-1991 Wildlife and Architecture Issue, a VFNH Single on NF/DF Slater Paper Showing Tag Residue Smeared on the Face

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A VFNH single of the 6c Red Fox from the 1988-1991 Wildlife and Architecture Issue, printed on NF/DF slater paper, showing errant taggant residue smeared on the face. This is unusual as these stamps are supposed to be untagged, and this is the first one we have found in examining a few hundred mint singles. 

On this issue paper fluorescence has been completely ignored because the perception is that all the stamps are on dull paper. However, this is a bit of an oversimplification, as the pictures of some of the low value stamps will show. While it is true that the coated Slater, Harrison, Rolland and Peterborough papers are generally dull on the face, or non-fluorescent on the face, stamps on Coated Papers Paper are truly "dead" on the face most of the time and are much darker under UV than the stamps on any other paper. On the back, the papers vary from NF which is quite greyish to DF cream to a very light low fluorescence on some of the Harrison papers. 

Unitrade does not list this variety, but my estimate of the value is $5. The stamp offered here grades 75 as follows:

Centering/Margins 45/70

Paper freshness: 5/5

Colour: 5/5

Impression: 5/5

Absence of visible paper flaws: 5/5

Perforations: 10/10