Response to TechPan Marks

I've done a few rolls of Techpan (35mm). Loading in the dark is not a requirement, but avoid direct lighting. I think the base is similar to HIE infrared and acts like a light pipe. However, Tech Pan has an anti-halation coating on the back so this effect is minimized. HIE does not have the coating and any strong light that hits the back will travel down the inside of the film (you can see this effect with a strip in an enlarger, the edges of the film glow). Most of the problems with development is because of the very high contrast nature of the film. Any screwups will show up as streaks and smears in large areas like the sky. I've never heard of spots or other small defects (at least regarding Tech Pan).

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