A trip to our local charity thrift shop this week turned up a surprising treasure:This is a paper matrix that was used to cast the plate for the September 27, 1971 front page of our local newspaper. This close up shows how deep the original halftone image (on the left) and type (on the right) were pressed into the paper matrix that would later be covered in molten metal to form the actual printing plate:
Here is a short video clip from 1950 that shows the process of making a newspaper stereotype plate from a paper matrix.
Preview images from the video
Please press the play arrow to view the video. Note that it may stop for a moment while the video buffers in the background.