Printing Inks Used On The 1967-1973 Centennial Issue - Part Four of Eight
20c Dark Blue - Quebec Ferry
There are two distinct groups of shades on this value. On the stamps issued with dex gum, the shades range from a steel blue to a deep blue and finally to indigo. This last shade contains quite a lot of black, and is very dark. The stamps issued with PVA gum tend to be printed with much brighter shades of blue, with the deepest ones being close to the brightest of those with dex gum.
Dex Gum Stamps
The bottom left stamp is an almost perfect match to Gibbons's steel blue, and appears much brighter than the two stamps on the row above. Finally, the stamp to the right is very close to Gibbons's deep blue, but is just a little bit darker.
All of these stamps are printed on cream coloured vertical wove paper. The gum types vary from type 1 to types 3 and 4 dex gum.
PVA Gum Stamps
To give you a better idea of the contrast between the indigo shade of the dex gum printings and the deep bright blue of the PVA gum stamps, take a look at this scan:
25c Slate Green - Solemn Land
This is another stamp from this series which was only printed by CBN, and was only ever issued with dex gum, as the replacement stamp from the next series was first issued in early 1972. Still it is curious that there were no printings from late 1971 with PVA gum, as this would have been a reasonably heavily used stamp.
There are a surprising range of shades on this stamp, many of which are quite subtle, but some of which are quite extreme. The basic colour is bottle green or slate green, and the shades vary in terms of the amount of blue contained and the green and the amount of black. There is also variation in terms of depth and dullness.
The stamp on the left is a perfect match to Gibbons's deep grey-green. This stamp is printed on cream horizontal wove paper with a clear vertical mesh and type 1 dex gum. The stamp in the middle is close to this shade, but it has a bluish tinge, and contains less grey. This stamp is on vertical wove with type 1 dex gum also. The stamp on the right is the same basic shade as the left stamp, but without the grey undertone. This stamp is printed on cream vertical wove, with type 4 dex gum.
Now, lets take a look at the second row:
Now let's finish with the third row:
50c Orange Brown - Summer's Stores
This is another stamp that, at first glance, appears not to have a lot of shades, but actually has quite a number. Once again, there is a clear demarcation between the shades found on the printings with dex gum, and those found on the stamps with PVA gum. The two basic shade groupings are orange-brown and brown-orange. The PVA gum stamps and some of the dex gum stamps are shades of brown-orange, while some of the dex gum stamps are more of a brown-orange, where the shades contain more brown than orange.
I will show all the shades together on one scan, will describe the basic differences between the broad shade groups and will then look at each row up close:
There is no brown-orange swatch on the Gibbons colour key, but the left stamp matches what I think this swatch would look like if a small amount of brown were to be added to the orange swatch. The stamps to the right are both much more orange, with the stamp in the centre being the deeper of the two. These two stamps are more of a brownish orange, which is what you would have if you took the orange swatch and added about one eighth to one quarter brown, whereas the brown orange is closer to 50% brown.
The two stamps with selvage on this row are printed on low fluorescent, vertical wove paper, with clear vertical mesh and types 1 and 3 dex gum. The middle stamp is printed on dull fluorescent, vertical wove paper with clear vertical mesh, and type 1 dex gum.
Now let's take a look at the second row:
The left stamp is a slightly deeper and browner version of the brown-orange. This stamp is printed on hibrite horizontal wove paper with clear vertical mesh and type 8 dex gum. The middle stamp is closest to Gibbons's orange-brown, but is more orange and lighter. This stamp is printed on dull fluorescent horizontal wove paper, with type 4 dex gum. The stamp on the right is a bit more orange, once again, and a bit deeper than the centre stamp. This one is printed on dead, vertical wove paper with type 1 dex gum.
Now let's move on to the third row:
$1 Carmine Red - Edmonton Oilfield
Of all the high value stamps of the series, this one has the most subtle of the shade differences, and it may first appear as though there are no shade differences. However, with patience and care, it is possible to see variations in how much bluish undertone is present, versus how much scarlet there is in the shade. The dullest and most bluish shades seem to be limited to the dex gum stamps, while the brightest and most scarlet of the shades seem to be limited to those stamps issued with PVA gum. In comparing the shades of this stamp, I find that it is best to focus on the dirt road in the foreground.
Stamps With Dex Gum
To see the differences more closely, I will show two close up scans, with the first being stamps 1 and 2, and the next one being stamps 2 and 3:
Here, the bluish undertone of the left stamp is much more apparent in this scan, when compared to the stamp on the right. Both these stamps are printed on vertical wove paper with faint vertical mesh, and type 4 dex gum. The paper of the stamp on the left is dead under ultraviolet light, whereas the paper of the stamp on the right is a low fluorescent bluish white.
Both stamps on the second row are a much duller shade, and both contain a strong bluish undertone, with the stamp on the right being both deeper, and duller than the one on the left. Let's take a close look at these to get a better idea of what the exact shades are:
Stamps With PVA Gum
The PVA gum stamps are closest in shade to the first dex gum stamp shown above. In other words, they are closest to what deep rose red would look like if a little scarlet were added to the mix.
This concludes my examination of the shades of the Centennial issue stamps as they appear in ordinary light. Next week, I will start looking at the shades as they appear under long-wave ultraviolet light.