- When printing screens over screens, the printer has to be careful
to avoid moiré patterns
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- To achieve this, the screen angles for each color must vary by 30
. Black is always at 45 , so the other screens would have to be printed
at 15 , 75 and 105
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- However, the fourth colour would have the same angle as the first
- which won't work
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- One color screen must be out of 30 variance with the rest, so yellow
is printed at 0 . (Yellow is much lighter than the other colors and
the moiré it creates is less noticeable.)
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