diff --git a/README.md b/README.md index 66d30c1..6fcbe2c 100644 --- a/README.md +++ b/README.md @@ -737,6 +737,40 @@ I didn't test it as thoroughly as I did D-23, so it might just be a lack of understanding on my part. + +### Update 12-16-2023: Using An A Conventional Daylight Tank For Rollfilm + +Periodically going into a darkened darkroom to agitate film in an open +tank is inconvenient. For sheet film, it's sort of the easiest way to +do it, unless you want to resort to making your own light tight tubes +in the manner of someone like Steve Sherman. Either way, you want to +keep the film off the bottom of the container and have minimal contact +between the film and it's support mechanis. For this reason, I +continue to open tank process sheet film and suspend it with Kodak #6 +hangers. + +For 35mm and rollfilm, it's appealing to be able to do this in a +conventional Nikor style daylight tank. The issue is that you still +have to suspend the film above the bottom of the tank to reduce the +risk of bromide drag. + +Someone suggested the idea of using an empty reel at the bottom of the +tank, and loading the reel with film on top of it. I tried this with +35mm and got ... lots of streaking along the edge of the film closest +to the empty reel below it. This supports the hypothesis that too +much material in the way tends to trap used developer and produce +bromide byproducts. So no, and empty reel to hold the film off the +bottom is not recommended. + +Next, I tried a small inverted funnel in the tank. This lifts the reel +off the bottom of the tank, with nothing immediately below the loaded +reel's film wind layers. This worked great, and is now how I do 35mm +EMA and semistand. + +I have not tried this with 120 rollfilm, but I suspect I'd get similar +results and for the same reasons. + + ## Copyright And Use All content here is Copyright (c) 2021-2023 TundraWare Inc., Des Plaines, IL USA