Canada #540i 6c Buff, Red & Brown Copper Mine River, 1971 Samuel Hearne Issue, A VFNH Single With Weak Kiss Print Doubling Of Inscription, DF/DF Yellowish Grey & Thicker Red Inscription

A VFNH single of the 6c buff, red & brown Copper Mine River from the 1971 Samuel Hearne Issue with weak kiss print doubling of inscription, DF/DF yellowish grey & thicker red inscription.

Our estimated 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

This issue continues the use of the paper introduced on the previous Papineau issue. This paper is, a new type of chalk surfaced paper appears and has a stiffness similar to earlier issues, but not thick like the earlier surfaced papers. The default fluorescence level is DF on both the front and the back, though there are some variations in the observed colour of the paper under UV light.

In describing fluorescence on these issues and all the stamps issued after 1970, it is critical to understand the Irwin-Freeman scale of fluorescence, which ranges from 0 to 12 and that a particular designation like say HB or HF will correspond to more than one fluorescence level. One pitfall that many collectors fall into is to compare the papers, rank the fluorescent reactions from low to high and then try to force them into the DF/LF/MF/HF and HB nomenclature, rather than recognizing that three different levels of reaction may actually correspond to the same designation. This is why Unitrade's listings for this period are so confusing. Generally HB corresponds to levels 10 through 12; HF, levels 8 and 9; MF, levels 7 and 6; F, level 5; LF, levels 3 and 4; DF, levels 1 and 2 and finally NF corresponds to 0.