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inspect the narrowest bar and narrowest space after printing (wait
about 30 minutes to 1 hour for any bleeding of the ink to
complete). They should be very close to equal. If they vary by
more than 10% from each other, then the exposure on the film
must be changed; if the bars are too big, expose less; if the spaces
are too big, increase the exposure.
Don't forget to leave a 1/4" white space to the left of the bar code and a 1/4"
white space to the right of the bar code (no text or other graphics in these areas).
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