APUG - View Single Post - Experiments with Metol and ascorbic acid.

gainer · 06-06-2007, 04:00 AM

I'm ashamed to say it, but 8.5 grams of Metol are 0.025 moles, although the resulting solution contains 0.05 moles of 4(methyl-amino)phenol after the sulfuric acid has been separated. The 3.44 grams actually make 0.02 moles of 4(methyl-amino)phenol. By some bit of luck, or maybe my brain was working then, I got the amount of hydroxide right so the solution pH is as close to 9 as my pH strips will tell me.

I found that the developer using phenidone gives about 1 f-stop more film speed, although I used the box speed with the Metol version and got good shadow detail. I guess the phenidone version would be good for unavailable light.

06-06-2007, 04:00 AM	#12 (permalink)
gainer Join Date: Sep 2002 Posts: 3,035	I'm ashamed to say it, but 8.5 grams of Metol are 0.025 moles, although the resulting solution contains 0.05 moles of 4(methyl-amino)phenol after the sulfuric acid has been separated. The 3.44 grams actually make 0.02 moles of 4(methyl-amino)phenol. By some bit of luck, or maybe my brain was working then, I got the amount of hydroxide right so the solution pH is as close to 9 as my pH strips will tell me. I found that the developer using phenidone gives about 1 f-stop more film speed, although I used the box speed with the Metol version and got good shadow detail. I guess the phenidone version would be good for unavailable light. __________________ Gadget Gainer