Kodak Photo-Flo Wetting Agent 200 is a final rinse aid for film before drying, 473 ml concentrate.
What it is for
The last step of processing, and the one most often skipped and then regretted. A wetting agent breaks the water's surface tension so it sheets off the film instead of standing in drops. Drops dry into limescale marks that show in a scan as pale rings, and removing them from dried film is next to impossible.
How to dilute it
It dilutes very far — a few drops per tank, no more. Too much leaves streaks of its own, so here less really is better. A bottle lasts years.
Storage
Sealed concentrate keeps well but dislikes air: the emptier the bottle, the faster it oxidises. Decant the remainder into a smaller bottle, or displace the air — that is what gets a concentrate to its last measure.
How it compares
The best-known wetting agent there is, effectively the industry standard. The catalogue carries Rollei and Foma alternatives; the differences are small and price per bottle mostly decides.
