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With bromide papers coming into general use in electrocardiography, one of the troublesome problems now confronting the operator of these instruments is the cracking and curling of the finished print.
I believe it is well known among commercial photographers that the use of glycerin will prevent breaking or curling of prints, but this does not seem to be so well known among those operating the electrocardiograph. Therefore it seems worth while to present the method which I have found satisfactory.
After the prints have been thoroughly washed, they should be squeegeed to remove the excess water, which would otherwise dilute the glycerin solution to be used below the point of efficiency. The print should then be immersed in a solution of distilled water, 80 per cent, and glycerin, 20 per cent. While the prints are in the glycerin bath, care should be taken that they do not stick together, and that
Keyes FW. NONCURLING SOLUTION FOR ELECTROCARDIOGRAPHIC PRINTS. JAMA. 1927;88(19):1482. doi:10.1001/jama.1927.92680450026011a