Jean-Claude Mougin (pdf) - Picto Benelux

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7.3.1. Personal method #2 ✌ With this more convenient method the oxidizer is introduced in the developer – and not, as previously, in the emulsion. This allows to save some potassium chlorate which is an unstable product, dangerous to manipulate, and difficult to weigh. Two oxidizers were tested: a 3% hydrogen peroxide solution, and a 4 % potassium dichromate solution. Tests completed on Arches Platine paper very contrasty negative: density range 1.95 potassium oxalate ................. 24 cc oxidizer .................................... 0 cc contrasty negative: density range 1.8 ammonium citrate ............... 100cc oxidizer .................................. 0 cc potassium oxalate ............... 100 cc oxidizer .................................. 1 cc medium contrast negative: density range 1.35 ammonium citrate ............... 100,0cc oxidizer .................................. 0,5 cc potassium oxalate ............... 100,0 cc oxidizer .................................. 1,0 cc moderate contrast negative: density range 1.20 ammonium citrate ............... 100cc oxidizer .................................. 1cc potassium oxalate ............... 100cc oxidizer .................................. 2cc low contrast negative: density range 1.05 ammonium citrate ............... 100cc oxidizer .................................. 2cc potassium oxalate ............... 100cc oxidizer .................................. 4cc For warm tones, process in citrate developer (see below). Sodium citrate, which is my preferred developer, can be used at t° as low as 7°C. Contrast increases and tones are colder. 25
8. Sensitizing the Paper 8.1. Required equipment • one of the papers selected under 6.6 • the prepared ferric oxalate, palladium & oxidizer solutions • in each 125cc bottle, a 1ml syringe without its tip : 1 ml BD PLASTIPAK or similar – they will be used as measuring instrument or dropper and stay permanently with their respective bottles • cover the syringe's graduations with tape to avoid them to be dissolved in the solutions • a graduated set square and a fine pencil ( 0.5) • various types of tape: Scotch, Tesa Post-it, microporous bandages • 1 brush similar to Pébéo Orion brush series 9451 (flat brushes made of yellow polyamide fibre with very fine tips, stainless steel furrule and a long handle.) • cover metallic furrule with tape to avoid every metal-emulsion contact • a plastic or porcelain cup • a lab wash bottle filled with distilled or mineral (Volvic..) water • kitchen roll 8.2. Define the borders of the area to be sensitized Determine an area to be sensitized corresponding to the size of the negative. If you wish to have straight edges, mark them with pressuresensitive adhesive tape: • with Scotch Tape for the "technical" papers • with Scotch or Tesa tape, without excessive pressure, for Arches or watercolor papers 8.3. Prepare the iron-palladium mixture • measure the surface • multiply this surface expressed in cm² by 4, and divide the result by 1000. The result corresponds to the quantity of emulsion (in cc) sufficient to cover the delimitated surface : For instance, in case of a 150 cm² area 150 x 4 = 600 : 1000 = 0,6 corresponding to 0,3 cc of ferric oxalate and 0,3 cc of palladium • Syringes should be preferred to droppers for measuring those quantities, as droppers give rather unpredictable results. • A drop usually is equivalent to 0,05 cc, which means that about 10 drops are needed for 150 cm2. 26
Page 2 and 3: Jean - Claude Mougin Palladium the
Page 4 and 5: I - THE OBJECT 3
Page 6 and 7: 2. Athena Pallas and the Origin of
Page 8 and 9: 4. The Aura Walter Benjamin was a p
Page 10 and 11: 5. The World and the Earth Athena's
Page 12 and 13: 6. The Offshoot In presence of a de
Page 14 and 15: 1. Historical Background 1803. Woll
Page 16 and 17: 3. Summary Description Palladium an
Page 18 and 19: In order to determine the density r
Page 20 and 21: 6. The Paper 6.1. Handmade, machine
Page 22 and 23: ➢writing papers • Currently, al
Page 24 and 25: 7.2.6. Fine-tuning for contrast The
Page 28 and 29: • Take the ferric oxalate and the
Page 30 and 31: 10.3. Exposure timing Proceed as us
Page 32 and 33: Baths to be used at temperatures be
Page 34 and 35: • All paper types can be used pro
Page 36 and 37: III - THE RECIPES 35
Page 38 and 39: 1. Contrast Intensification for Neg
Page 40 and 41: • Allow the mixture to settle for
Page 42 and 43: • Follow the sketch below for the
Page 44 and 45: Ruscombe Paper Mill http://www.rusc
Page 46 and 47: ABNEY, William Wiveleslie de ALVARE
Page 48 and 49: V - TABLE OF CONTENTS I. THE OBJECT

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