2. Turn on the camera or smartphone and adjust the positioning of the camera/smartphone so that it is as close as possible to the backlit negative and is still in focus. You may need to use the macro setting of the camera to do this. It is OK to use the automatic or P mode on y...
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but the procedure for testing neutralization efficiency is different. One set-up is that 5 x 5 cm stainless steel coupons are immersed in disinfectant and left to dry for three hours. Then the surfaces are swabbed, the growth medium added, and each sw...