Difference between revisions of "Ewesly / Holographic Formulae / BBAA, JD-4, TJ-1"

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<p>Mix equal parts together before use.<br />
 
<p>Mix equal parts together before use.<br />
 
</p>
 
</p>
<p><u>Development time:&nbsp;</u> <br />
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=== Development time ===
 
   45 seconds at 22C (72F) for Harman HoloFX plates. <br />
 
   45 seconds at 22C (72F) for Harman HoloFX plates. <br />
 
30 seconds at 18C (65F) for GEO-3 and PFG-03M.&nbsp; <br />
 
30 seconds at 18C (65F) for GEO-3 and PFG-03M.&nbsp; <br />
   5 minutes at 20C (68F) for BB series plates. </p>
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   5 minutes at 20C (68F) for BB series plates.
 
<p><u>Agitation:&nbsp;</u> Constant<br />
 
<p><u>Agitation:&nbsp;</u> Constant<br />
 
</p>
 
</p>

Revision as of 17:25, 1 January 2014

The first time I saw this formula was in the instruction sheet for the old HRT BB series of plates when they were produced in Germany. So back in the 20th century I dubbed it BBAA, for Birenheide and Blyth Ascorbic Acid, but I might be the only one calling it this. The original pamphlet did not give it a name. A colleague of mine, Rick Bruck, calls it HRTd, Holographic Recording Technology developer. Steve (LoserSmith) Smith calls the diluted version of it TJ-1, which TJ calls JD-4. (See below.) The current producers of the BB series of plates, Colour Holographic, have replaced the metol with 1 g of phenidone plus a couple other tweaks in their currently recommended developer[1] for these plates.

BBAA

from Holographic Recording Materials, circa 1997[2]

4 g  Metol
25 g  Ascorbic Acid
70 g  Sodium Carbonate
15 g Sodium Hydroxide
One litre water

Development time

5 minutes at 20C (68F) for BB series plates.

 Agitation:  Constant

JD-4 Kit

But the exact same ingredients are used in the JD-4 kit sold by Photographers Formulary[3], but broken into A and B solutions, so that the JD-4 working strength is half of that of the original BBAA formula. (The original recipe put all the ingredients in just one litre of H20; so an A/B configuration makes twice as much soup for half the price!)  This developer, used in the cold water JARB developing scheme, works excellently for the ultra-fine grained Soviet-style materials like PFG-03M or GEO-3[4].

PART A
4 g  Metol
25 g  Ascorbic Acid
One litre water

PART B
70 g  Sodium Carbonate
15 g Sodium Hydroxide
One litre water

Mix equal parts together before use.

Development time

 45 seconds at 22C (72F) for Harman HoloFX plates. 

30 seconds at 18C (65F) for GEO-3 and PFG-03M. 

 5 minutes at 20C (68F) for BB series plates.

Agitation:  Constant

Recommendations

Primary recommendation for developing the GEO-3 and PFG-03M materials. Follow with a rehalogenating/diffusing bleach for no emulsion shrinkage, or 'Chrome bleach for change of replay wavelength in the reflection mode.

This developer, even followed by a rehalogenating bleach, applied to BB series plates gives a significant amount of shrinkage, from red to green, which might be a pleasant color for the application.  Kodak D-8 or a pyrogallol-based developer helps prevent the color from shifting with these materials.

Shelf Life

Part A can last a month in a tightly stoppered bottle; Part B can last indefinitely.  The combined solutions can last at least a day in a covered tray.

Notes and References

  1. I would love to link to their current recipes, but their latest (April 2011) web site does not have a processing page. Click here to link to a pdf of the last one that I had downloaded from 2008.
  2. Holographic Recording Technology brochure
  3. Photographers’ Formulary JD-4 kit
  4. [[Media:chprocess.pdf | Colour Holographics brochure]