Hypo Clearing Agent

[Neal]

Dear justinphilip,

The "three buckets" are steps in the process. To make the stock solution, start with 3 liters (0.8 gallons) of water. It doesn't have to be exactly 80°F, but a bit warmer than room temperature helps. In the second step, add the entire package and mix until dissolved. In the third step, add water to equal 1 gallon. When you go to use it, determine the amount you need and make up your working solution by mixing 1 part of stock solution with 4 parts of water. Ignore the 3 months storage limitation, it lasts much longer than that in full sealed bottles. I keep the working solution in separate 1 liter bottles.

Neal Wydra

 

[Fabian]

maybe this is called hicheking the threas, but: Can I use a working solution for more than one film? just yesterday I developed 3 rolls in Jobo tanks (a one-tank and a two-tank) prepared 500ml of working solution, did it with the one-tank. 250ml of course, then i just filled it back to the non used 250ml and used those 500ml for the remaining two-tank. Then i discarded the hypo. I once heard that this is single shot only, but then again I have never encountered any problems.

I always do the mixing like this: get myself a bucket, or bowl, with the desired markings. (I think it is 3 and 3.8 litres).
1) pour in the water at the temperature it shows, to the first marking
2) Fully dissolve the powder
3) Fill it with water to the second marking
4) stir and then fill into some bottles, label them. There you go.

5)working solution is prepared easily. 1 part hypo (1+0 - stock) and 4 parts water.

Btw: how important is the temperature of the water to mix the stock solution? There is an exact number of degrees. (21C I think). I'm always pretty exact but it annoys me a bit to temperature 3L. Will +/- a few degrees also work?

 

[Tom Hoskinson]

Btw: how important is the temperature of the water to mix the stock solution? There is an exact number of degrees. (21C I think). I'm always pretty exact but it annoys me a bit to temperature 3L. Will +/- a few degrees also work?

Not very important. HCA wiil dissolve more readily in warm water (18C and above) than it will in water that is colder than 18C.

The average temperature in my air conditioned Lab is around 21C.