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Spoon Measured Developers.
I found this site which says that developers like D76 and D72 can be made by spoon measures instead of weighing each of the dry chemicals.
How accurate is this? http://www.farahmahbub.com/VirtualMa...cktoBasics.htm |
#2
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Spoon Measured Developers.
"Darkroom User" wrote in message news I found this site which says that developers like D76 and D72 can be made by spoon measures instead of weighing each of the dry chemicals. How accurate is this? http://www.farahmahbub.com/VirtualMa...cktoBasics.htm -- Darkroom User I haven't looked at the site but most developers are not very critical of quantities. There were many teaspoon formulas for Amidol developers for instance. I suppose if you are careful you can even get good consistency from one batch to another. -- -- Richard Knoppow Los Angeles, CA, USA |
#3
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Spoon Measured Developers.
"Peter" wrote in message ... On Mar 2, 1:11 pm, Darkroom User Darkroom.User. wrote: I found this site which says that developers like D76 and D72 can be made by spoon measures instead of weighing each of the dry chemicals. How accurate is this? http://www.farahmahbub.com/VirtualMa...cktoBasics.htm -- Darkroom User Interesting. Text could use a little editing. Some obvous places: "face musk is an appropriate addition" (mask?) "Add a pinch of Sodium to the water before adding the Metol to prevent the initial oxidation" (avoid pinching the sodium; putting it in the water may have surprising results; you mean Sodium Sulfite - I think) "Four Possessing Trays { large enough to hold the selected size }" (Processing) He means sodium sulfite but its based on a mistaken idea that the sulfite will absorb any free oxygen in the water. Actually the metol is pretty effective at doing that and its more effective to boil the water for a few minutes before using it to mix the developer. Boiling will drive off dissolved gasses, remove some hardness, and coagulate any organic matter which will precipitate as the water cools. Metol will not dissolve in a strong solution of sulfite which is why its always the firt ingredient (after water) in any formula including it. In general, I don't like inexact measurment even for relatively non-critical applications as B&W photographic processing solutions. The range of error is suggested by the variation in the different versions of similar developers. The same thing applies to cooking, what exactly is a teaspoon,a scant teaspoon, a rounded teaspoon, a heaping teaspoon? A pinch of something? This is OK as an emergency measure but decent used balances are available cheaply. Actually, a digital postage scale will work for smaller quantities. -- Richard Knoppow Los Angeles WB6KBL |
#4
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Spoon Measured Developers.
In article ,
Richard Knoppow wrote: (avoid pinching the sodium; putting it in the water may have surprising results; ) Indeed! Almost got me expelled from junior high school, that did... -- Thor Lancelot Simon And now he couldn't remember when this passion had flown, leaving him so foolish and bewildered and astray: can any man? William Styron |
#5
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Spoon Measured Developers.
Richard Knoppow wrote:
This is OK as an emergency measure but decent used balances are available cheaply. Actually, a digital postage scale will work for smaller quantities. I have an Ohaus 610 gram triple beam balance. It now costs more than when I got mine almost 40 years ago. Many years ago I was on a grand jury and some poor guy was being charged with being a drug dealer. While deliberating, I pointed out that I had one just like it in my darkroom. No other evidence was presented. We no-billed that one. -- .~. Jean-David Beyer Registered Linux User 85642. /V\ PGP-Key: 9A2FC99A Registered Machine 241939. /( )\ Shrewsbury, New Jersey http://counter.li.org ^^-^^ 15:00:01 up 4 days, 1 min, 3 users, load average: 4.68, 4.66, 4.64 |
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