Photogravure uses light to 'burn' small 'puts' in a plate, These 'puts' hold the ink from which the image is printed after the plate is wiped clean. The number of dots per inch is the 'screen.' The phosphor bars are printed from a separate plate. The '150' phosphor screen that your stamp appears to have has 150 phosphor ink dots per inch. The '250' screen has 250 dots per inch.
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Posted 02/17/2024 09:44 am
