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Test Your EFO Knowledge: Quiz Answers

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Above, we show the "problem" stamps in the left column, and the ones with the correct color in the right column.

The gray areas of these stamps were all discolored by long-term exposure to light, probably fluorescent light. The affected areas are originally gray on all stamps (as shown in stamps in the right column), and colored with the identical Pantone Matching System color known as PMS gray 443. This color is composed ofthere specific PMS colors: Green, Transparent White and Warm Red. It is possible that the Warm Red component disintegrates when exposed to light over a lengthy period of time, resulting in a green shade.





Former Editions:



Ink, being liquid, is sometimes hard to control at the 100% level. So, it will get where it does not belong, and we find it on both older and more modern stamps randomly. This sort of material has no major following in the hobby, and the result is that there are no hordes of people competing for examples. The law of supply (though this material is unusual) and demand (of which there is not much) means that prices are minimal. Nevertheless, the hunt for such items is a lot of fun.

For more detail, see the April-June 2017 (whole number 187) issue of The EFO Collector, p. 16.



These items have so-called slime holes or slime spots.
These occur when bacteria form slime in the "white water" which is used for the dilution of the pulp mixture before its gets to the paper machine.
For more detail, see the January-March 2018 (whole number 190) issue of The EFO Collector, p. 13.
Also, see here.




Test stamp.
January-March 2018 (whole number 190) of The EFO Collector, p. 16.

Printing gap caused by a string, Printers sometime carried bits of string to clean ink off their hands or from the plates. A piece might easily fall onto the paper during production and then dislodge after printing, leaving a gap.
January-March 2018 (whole number 190) of The EFO Collector, p. 15.

Paper crease.






 

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