Yesterday I completed a video about performing ISO speed testing on Harman Direct Positive Paper. I hope you find it informative.


PS: You might have noticed on the two darker prints that the left and right borders have a strip of white, this was because my new Jobo extension tube doesn't have the ridges for 4-by-5 paper, so I had to tape the paper to the inside of the tank with drafting tape. The other two prints were in the bottom, original part of the tank.

I'm amazed that not only did the prints stay put without the tape coming undone while being wetted, but that only 100ml of solution is required.