JD Photochem went out of business over a year ago....
Originally Posted by walter23
See my Blog at http://clickandspin.blogspot.com
The greatest advance in photography in the last 100 years is not digital, it's odourless stop bath....
If the HQ - Peroxide - Sulfite solution is clear or tan, you have a good reaction. If it turns dark brown or green, you have a bad reaction.
Now, that is based on HQ to HQMS and Sulfite to Sulfate. However, the molar ration may vary quite a bit between these two. This is the "unknown" factor that Jerry spoke of in his posts. The only way to fix it is to purify the HQMS, removing the Sulfite and Sulfate. Then you know what you have.
But, this purification is difficult and time consuming.
The prepared solution (1) was clear and developed within one hour a very light/bright yellow tint.
This part looked fine so far. What makes me wonder about is, that solution 2 (with the phenidone in, amber/yellow color)
discolorates if mixed together with solution 1 to form the final developer.
Anyway, we just started a barbeque, will check that later…
Ok here my results.
By homebrewing HQMS out of HQ it looks like essentially less HQMS is formed than is used normally in standard E6 first developer.
This means of course in addition that there are residuals of more active pure HQ. Same Times, routines and ingredients as in my actual homebrew gave me Slides overdeveloped about one Aperture, with weak D max and an overall yellow/green shift.
Not too promising… But this have to be said too, tonality looks good, color crossover is not visible or overlaid by color shift at the moment .
I’ll try the next days a second formulation where Solution 1 has significant more time for reacting (24 hours instead of one), but I suspect pure HQMS is definite the better option and this processing variant is not worth the hassle…
Another batch / some words to disclose my “Wheatcroft HQ / HQMS attempt”.
Yesterday a new solution 1 was created and stored for 6 hours. The solution was then brought to 500 ml and divided into 5 samples, stored in glass bottles in a water basin.
Sample Zero was kept unchanged, onto sample 1 where added 1ml H202 (30%), onto sample 2 where added 2ml H2O2, onto sample 3 3ml, onto sample 4 where added 4ml H202 to induce further oxidation.
Sample 2 , 3 and 4 showed a visible coloration towards orange/pink after a few minutes, 10 minutes later sample 1 began to change color too.
Sample 4 and 3 seems to decolorize / change color more to yellow after a few minutes more.
These 5 samples will now spend the night in the sink so give enough reaction time.
By the way, the color of sample 1 and 2 looks promising, bright orange/slightly pink, like freshly dissolved HQMS…
My hope is to transform the HQ residuals as far as possible to HQMS without creating larger amounts of benzoequinone (which does have a yellow color and will be probably present in sample 3 and 4).
10 hours later sample zero is still crystal clear, sample 1 (with the smallest addition of H202) show quite intense pink (darker than last night) coloration.
Sample 2, 3 and 4 show weaker coloration (sample 4 the weakest) and tend more to yellow.
Sample 1 looks so-so partway useable, but (over) oxidized, whereas sample 3 and 4 looking suspicious to benzoequinone.
Presuming that sulfite is still present some hyrdoquinonedisulfonate could be formed. (this is hypothetical, can’t analyze that)
In a perfect world a next approach would follow, to come as close as possible, via a very slow titration to the point where coloration begins…
But my time is limited and I do stop this now!
As Gerald Koch and PE mentioned earlier, this HQMS homebrew method will probably NOT produce a constant concentration of ingredients this easy way. Therefore it looks not very usable for getting constant E6 processing parameters, as necessary. This was a bit time consuming, maybe predictable but interesting (like the auto didactical attempt).
If HQMS is not available at all, it will be less difficult and more predictable to brew an (semi) adequate HQ/P or HQ/M/P first developer in the “Watkins” or “ZoneV” tradition.
Brew the “ZoneV” variant preferably without Benzotriazole which can give a slight magenta/green crossover. The latter FD behaves quite well, especially if a Carbonate / bicarbonate buffer is included and the pH is set properly to 9.65 at 25°C, but is (knowingly) not stable (which was the reason for this struggle…).
Hope not having bored you,
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Benzoquinone is quite insoluble and has an intense color and odor. The odor is so strong it cannot be ignored or missed.
Testing is probably the only way to examine this. Testing by development, that is.
Sorry, these cross test with various homebrews take really more time than I have actual, a nightshift week on work is just coming.
But there is a strange odor at the last 2 samples, somehow, how to describe, like a (smashed) ladybug…
You can run those tests with B&W film and short development times. Comparisons are possible that way.