Round to your taste. These are the numbers from the formula. I give them as I received them.
Round to your taste. These are the numbers from the formula. I give them as I received them.The numbers don't make any sense. But what gives; just round them to .1. Except the phenidone. That one can best be mixed as e.g. a 1% concentrate in glycol and then dosed with a pipette unless very large batches are being made.
Me neither and I have major doubts that a reasonably priced set of scales from Amazon is accurate to what is 4 decimal places but no others seem to be questioning this so maybe we are wrong and 2.1496 or 2. 1494 is sufficiently wrong to affect FX21's efficacy.
pentaxuser
Yes!
Round to your taste. These are the numbers from the formula. I give them as I received them.
Hmmm... What is still missing in that formula? I'm sure with some metaborate and 1.054g of Glycin it would perform much better. </sarcasm>The correct formula:
For 15x concentrate:
All weights in grammes per litre. For T-Max 400, use 1+9 for 11 minutes. For slower films (FP4+, T-Max 100, Delta 100), dilute more (1+14). For Pan-F, dilute 1+19, try 8 minutes to start. For Delta 400, try the same as for T-Max 400, to start with.
I am not sure how well Delta 3200 or T-Max 3200 will do in this developer, but try 1+5 dilution for 10-12 minutes.
Component Amount in grammes Metol 2.1495 Sodium Sulfite 30.0 Hydroquinone 1.0995 Phenidone 0.1245 Sodium Metabisulfite 6.15 Potassium Carbonate (monohydrated) 22.035 Sodium Bicarbonate 3.9 Sodium Citrate 3.9 Potassium Iodide 0.0825 Potassium Bromide 0.33 Sodium Hydroxide 5.0
These weight values are probably converted from another unit of measurement. They can be rounded to a reasonable accuracy. Regarding the carbonate - put in the one you have, just calculate the weight relative to the monohydrate. There is no monohydrate available here, only the anhydrous form. I assume that the original formula used something from the nearest general store. Unfortunately, there is no data on the pH of the working solution.
The correct formula:
For 15x concentrate:
All weights in grammes per litre. For T-Max 400, use 1+9 for 11 minutes. For slower films (FP4+, T-Max 100, Delta 100), dilute more (1+14). For Pan-F, dilute 1+19, try 8 minutes to start. For Delta 400, try the same as for T-Max 400, to start with.
I am not sure how well Delta 3200 or T-Max 3200 will do in this developer, but try 1+5 dilution for 10-12 minutes.
Component Amount in grammes Metol 2.1495 Sodium Sulfite 30.0 Hydroquinone 1.0995 Phenidone 0.1245 Sodium Metabisulfite 6.15 Potassium Carbonate (monohydrated) 22.035 Sodium Bicarbonate 3.9 Sodium Citrate 3.9 Potassium Iodide 0.0825 Potassium Bromide 0.33 Sodium Hydroxide 5.0
I would like Bill Troop to contribute to this thread as I believe it's from the FDC2.
But how to measure those .5 mg levels of chemicals!
Either pick up a scale on Amazon that'll do mg (I picked up a cheap digital one there), or round up the numbers.
It’s a bit of a Christmas pudding, isn’t it? I mean, it seems to have a bit of everything in it, including 3 developing agents. Would anyone care to suggest how it might all work?
If you think this formula is complicated, have a look at the MSDS for Spurs HRX. If I remember correctly, it's got two or three different types of Phenidone etcIt’s a bit of a Christmas pudding, isn’t it? I mean, it seems to have a bit of everything in it, including 3 developing agents. Would anyone care to suggest how it might all work?
Any information regarding the longevity of the 15x concentrate?
Any information regarding the longevity of the 15x concentrate?
I expect the working solution to last no more than 2-3 hours. For the concentrate - it depends a lot on how it is stored, but probably no more than three months. If the concentrate is made in two parts - the first glycol, the developing agents, potassium metabisulfite (replacing the sodium one from the original formula) and the limiters, and in the second - everything else. If the formula is changed to potassium, the concentration can become much larger and with a higher durability.
This formula is a little strange to me - I'm not a chemist, but from what I understand, the metabisulfite will react quickly with the hydroxide to form a sulfite with a very slight excess of hydroxide. These components are a little strange to me.
I expect the working solution to last no more than 2-3 hours. For the concentrate - it depends a lot on how it is stored, but probably no more than three months. If the concentrate is made in two parts - the first glycol, the developing agents, potassium metabisulfite (replacing the sodium one from the original formula) and the limiters, and in the second - everything else. If the formula is changed to potassium, the concentration can become much larger and with a higher durability.
This formula is a little strange to me - I'm not a chemist, but from what I understand, the metabisulfite will react quickly with the hydroxide to form a sulfite with a very slight excess of hydroxide. These components are a little strange to me.
That will be an interesting video, Andy. Seeing you mention D23 has reminded me that John Finch did a video comparing FX55 with D23after working with D-23 the past few weeks! Currently, I'm working on a video where I'll compare it with semi-stand in Pyrocat-HD.
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