How long would unmixed 777 last?

I have been using 777 for over a month now. Great results. I bought a 4 galloon pack and mixed up the first galloon dividing into working solution and replenisher. The 1/2 galloon replenisher is nearly gone so I will have to mix up a new batch soon (~20 rolls of 35mm). I am thinking about stocking up and buy more of the stuff. How long would the unmixed powder last?

Thanks.

Just a guess.... about forever.

You might ask BPI... they know what's in it

The first box of the stuff I got from BPI looked like it had been packed in 1955. Worked great. The subsequent boxes now look like they were packed about the time of the first moon landing. They work too.

I've kept the powders for up to 2 years and they worked great when I subsequently mixed them. The last two gallons I got were from my buddy in Louisville and consisted of 1 bag of white powders (A and B) with the familiar red label and 1 bag of something labelled Panthermic 777 Replenisher with a blue label instead of red and the A bag (i.e. the small one) of this set contained a powder that looked like dirt. This replenisher bag is how the 777 developer (red label) used to look when I first started using it 3 years ago but lately the powders in the developer bags have been all white. I'm hopelessly confused now.

I think I'll just mix up the Replenisher and use it as I've been using it; i.e., I dump half of my working gallon every six months and fill the jug back up with freshly mixed 777. Then I use the other half gallon of fresh as replenisher.

Anyway, the powders keep for a long, long time.

didjiman said:

I have been using 777 for over a month now. Great results. I bought a 4 galloon pack and mixed up the first galloon dividing into working solution and replenisher. The 1/2 galloon replenisher is nearly gone so I will have to mix up a new batch soon (~20 rolls of 35mm). I am thinking about stocking up and buy more of the stuff. How long would the unmixed powder last?

Thanks.

Click to expand...

Their published replenishment schedule is way overkill. I develop two 8x10s in a tray containing a full gallon. You want to develop with as much solution as possible with this stuff. I add about 1/2 ounce of replenisher for every sheet, but I only do it after 8-10 sheets. 1 roll of 35mm is roughly equivalent to an 8x10 sheet so 1/2 gallon, or 64 ounces of replenisher should last you at least 100 rolls of 35mm film.

Roger that, Clay & c6h6o3

c6h6o3 said:

Their published replenishment schedule is way overkill. I develop two 8x10s in a tray containing a full gallon. You want to develop with as much solution as possible with this stuff. I add about 1/2 ounce of replenisher for every sheet, but I only do it after 8-10 sheets. 1 roll of 35mm is roughly equivalent to an 8x10 sheet so 1/2 gallon, or 64 ounces of replenisher should last you at least 100 rolls of 35mm film.

Click to expand...

Well, for 35mm developed in a Jobo tank, their replenishing schedule is right on money. In other words, it takes ~40 to 45 ml. for each roll of film that got developed if I want to re-top off the working solution!