Ansco 130 From Dektol = Dektol 130?

[chuckroast]

So I made the mistake of buying the 130 kit from PF to "try" it and I discovered that I really liked it. While subtle, the shadow separation is definitely better to my eye than Dektol. Moreover, the keeping properties seem to be as claimed.

The problem is that I still have a ton of the "new" Dektol (the not muddy brown kind) and I don't want to just sit there. "Well", sez me, "according to various geniuses here and there, the formula are quite close for the two but one needs to add glcyin." The problem is, "How much"? It then occurred to me that if I carefully selected an amount of Dektol stock to match the ingredient concentrations in 130 as best I could, I could top it off so that these ingredients were now the same as 130.

So I ginned up a spreadsheet to fiddle with this and came up with the following:

That is to say, if I start with 0.71 liters of Dektol stock and add the components shown in the far right column,
I should get what amounts to Ansco 130 stock once I top it off with water to 1 liter.

However, some notes are in order:

• While I have mixed up a liter of this "Dektol 130", I haven't actually tried it yet.
• I converted the formula to use Sodium Carbonate Monohydrate, because that's all I have here.
• This does assume that the D-72 formula is close enough to Dektol for these substitution calculations.
• Ignore the Benzotriazole cell on the left. That's just there to remind to to try it once I get this working.

 

[Alex Benjamin]

Took me a while to figure out why 710 ml of D-72 until I realized it was because of the metol.

 

[chuckroast]

Took me a while to figure out why 710 ml of D-72 until I realized it was because of the metol.

Yeah, I fiddled with it in the spreadsheet until I got there.

 

[Don_ih]

If you got it to mix together, it should work fine. You can see that the Glycin and large increase in Potassium Bromide are what actually make the difference.

 

[Alex Benjamin]

That is to say, if I start with 0.71 liters of Dektol stock and add the components shown in the far right column,

Not sure you're going to get all of them to dissolve in an already mixed solution, especially one at room temperature. Perhaps mix the missing components in the 290 ml of water first, then add that to the D-72.

 

[chuckroast]

Not sure you're going to get all of them to dissolve in an already mixed solution, especially one at room temperature. Perhaps mix the missing components in the 290 ml of water first, then add that to the D-72.

I raised the temp of the stock Dektol to about 120F with a heated mixing plate to get each component in solution.

 

[Alex Benjamin]

I raised the temp of the stock Dektol to about 120F with a heated mixing plate to get each component in solution.