The Shade Variations on the 1972-1978 Caricature Issue of Canada
In terms of colours, the orange inks seem to exhibit the most variation, followed by the blue inks. However, as I said above, all but two of the denominations exhibit at least 2 variations in shade, with the 4c Mackenzie King and the $2 Quebec being the only stamps for which I was not able to find any significant variation in the stamps that I studied. The $1 Vancouver showed a surprising amount of variation on the last printings, as did the 3c Robert Borden stamp.
Some of the shade varieties were specific to the printer, as was the case with the CBN and BABN printings of the 1c, 2c, 6c, 7c and 8c, while others were associated only with certain type differences. The 10c and 25c both included some shade combinations that are only found on type 1, type 2, or the later perf. 13.3 type 2 stamps.
As I mention in my detailed post, I believe that the varieties that I illustrate represent probably about 75-80% of all the shade vareties that exist. However, I do believe that the very high number of stamps printed and used likely means that additional shade varieties do exist and can be found, with patience and careful study of used stamps, which had not received much attention from philatelists at all.
Below are two examples of the kinds of variations that I illustrate throughout my detailed blog post:
Here, if you look carefully, you can see that the left stamp and second stamp from the right are both lighter colours than the other two stamps. Then, if you compare them, you should be able to see that the third stamp from the left contains more purple and less brown. Finally, if you compare the second stamp and right stamp, you can see that the right stamp is a much colder shade than the other stamps, and contains more brown and less purple.