Multiple choice general knowledge

On sheets of stamps printed by Harrisons between 1972 and 1979 spots of colour appeared in the gutter between one pair of stamps per sheet. What are they known as?

  1. Ink spots

  2. Printer blobs

  3. Colour spots

  4. Traffic lights
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Traffic lights is correct - the spots of color appearing in the gutter between Harrisons-printed stamps (1972-1979) are known as traffic lights by collectors. These are registration marks from the printing process and are sought-after varieties, not printing errors or accidental ink spots.

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