This is the source of another common error, both in this test and in making print exposures after test strips normally. Having made the test strip in a series of intermittent short exposures, the subsequent print is mistakenly made with one long composite exposure. For example, if the test strip showed correct exposure at seven one-second exposures, the print is then made with one seven-second exposure. Due to what is known as 'the intermittency effect', this is wrong. The single longer exposure will produce significantly greater density than several intermittent ones of the same total duration. Even many professional printers are unaware of this and attribute the difference to dry-down, which is present as well
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