Peda Heda

MAKING A TEST STRIP

PROCESSING

There are so many recipes out there it is beyond the scope of this part of the exercise to enumerate them all.  But some general recommendations follow.

The JD-3 and JD-4 kits sold by Integraf or Photographers’ Formulary would be good starting points for this exercise, as when properly done the final results will provide a reflection hologram that replays in the same color as the laser that recorded it.  This helps in the Assessment stage.

Development: Keeping development temperature constant will help ensure consistent results from session to session.  The extremely fine-grained Russian emulsions, Slavich PFG-03 and Sphere-S GEO-03, benefit from 15 degrees Centigrade (65 degrees Fahrenheit) developer temperatures!  Constant agitation is also important!  And timing is key!  Pick a time and stick to it!  Vary the exposure time to control how dark the hologram develops and ultimately how bright it gets.  What is the correct development time?  Make several plates of exposure series and develop them for different times, and see which looks the best!

Rinsing: By getting the developer out of the emulsion before the next bath, this rinse is key to longevity of the bleach and cleanliness of the final hologram. At least a minute with running water, preferably 2 - 3 minutes.

Bleaching: This isn’t like laundry bleach, but a processing step which ultimately makes the hologram brighter.  Agitation is not as critical as in development, but moving the plate around to freshen up the chemistry in the coating as it gets used up is a good idea.

Rinsing Again: To get the bleach out of the emulsion.  Sometimes the bleach leaves a color cast in the emulsion, once that disappears then the chemistry is completely removed, let it rinse another minute or so, then use the

Wetting Agent: which is a surfactant that lets the liquids sheet out of the light sensitive coating and prevents streaking, not unlike the final rinse in a dishwasher.

I personally do not use nor recommend squeegees or hair dryers to speed up drying times, having witnessed way too many disasters.

< back    next >