Printing Inks Used On The 1967-1973 Centennial Issue - Part Eight of Eight
20c Dark Blue - The Quebec Ferry
The inks used to print this stamp are primarily non-transformative in that in most cases, the appearance of the colour under UV light is either the same as, or just a bit darker than how the colour appears under normal light. There are however, some cases in which the ink loses much of the blue and becomes either a very deep blue-black, or black under the UV light. These inks are transformative.
Let's take a look at three stamps printed with non-transformative ink:
Here are the same two stamps under UV light:
25c Myrtle Green/Slate Green - The Solemn Land
From the stamps I have examined, the vast majority are printed in transformative ink which tends towards blackish green or black under UV light. A few printings were made in dull blue green which appears either darker under UV, or the same as normal light.
Let's take a look at two stamps which are printed in non-transformative ink:
Here are both stamps under UV light:
Let's now look at five stamps that are printed in transformative ink:
As is the case with practically all the hibrite stamps examined so far, the bottom stamp appears to have been printed from black ink.
50c Orange Brown - Summer's Stores
In terms of inks, this is one of the more interesting values in the series, because of the dramatic difference that introducing UV light makes to the appearance of most of the stamps. In ordinary light, the colour of this stamp is either a shade of brown orange (most commonly), or it is a shade or orange brown (less common). With only a few exceptions, the ink completely changes colour under UV - usually to shades of dark brown, dark red-brown or black.
All of the PVA gum stamps that I have examined thus far, and a few of the dex gum printings made on dull fluorescent paper, are printed in non-transformative ink. The colour appears far, far darker than in normal light. However, enough of the orange remains visible, that the fundamental colour under UV is not any different than under ordinary light.
Here are two such stamps in ordinary light:
Now, lets take a look at 6 stamps printed in transformative ink:
$1 Carmine Red - Edmonton Oilfield
Except for the printing on hibrite paper, all of the $1 stamps that I have examined are printed in non-transformative ink. The basic colour is deep scarlet red with a hint of carmine, and for most stamps, this colour merely appears deeper under the UV light. But in all cases, it is clear that the colour is a deep scarlet red or carmine red.
Let's start with five stamps printed in non-transformative ink.