Post by Steaphany on Aug 7, 2013 1:18:51 GMT
Now listed on My Site
From the Photographic Formulas from The Frugal Photographer:
This developer, invented by Harold Holden and Arnold Weichert in the late 1960's, was patented in 1973. The patent has expired, and the formula is now in the public domain.
H&W Control was sold in retail stores for several years, but did not receive widespread distribution. Before being commercialized, it was used extensively by the US military for developing surveillance films, the kinds used by top-secret high-altitude aircraft of the day such as the U2.
When mixed fresh, the H&W Control formula disclosed here will give you the same sensitometric results as the commercially packaged Bluefire HR. However its shelf life will be six months or less, depending on storage conditions.
First prepare:
H&W Control Mixing Solution A
to
add and dissolve
Second prepare:
H&W Control Mixing Solution B
to
add and dissolve
Third prepare:
H&W Control Stock Solution
add and mix
then add
Prepare:
H&W Control Working Solution ( 500 ml )
add and mix
Process at 20ºC with intermittent agitation for 14 to 18 minutes. Use working solution once and then discard.
Use with Bluefire Police, microfilms, and Kodak Technical Pan. Gives unacceptably flat images on ordinary films.
Shelf life of the concentrate is approximately six months in a full, tightly capped glass or PET bottle, less than one week in a partly full bottle. Refrigeration considerably prolongs shelf life. Normal color is pale yellow. Concentrate that has begun turning pink or red is oxidizing and should be discarded.
From the Photographic Formulas from The Frugal Photographer:
This developer, invented by Harold Holden and Arnold Weichert in the late 1960's, was patented in 1973. The patent has expired, and the formula is now in the public domain.
H&W Control was sold in retail stores for several years, but did not receive widespread distribution. Before being commercialized, it was used extensively by the US military for developing surveillance films, the kinds used by top-secret high-altitude aircraft of the day such as the U2.
When mixed fresh, the H&W Control formula disclosed here will give you the same sensitometric results as the commercially packaged Bluefire HR. However its shelf life will be six months or less, depending on storage conditions.
First prepare:
H&W Control Mixing Solution A
to
| Warm Water ( ~50ºC ) | CAS # 7732-18-5 | 50 ml |
add and dissolve
| Sodium Sulfite ( Anhydrous ) | CAS # 7757-83-7 | 1.0 gram |
| Hydroquinone | CAS # 123-31-9 | 0.16 grams |
| Sodium Carbonate (Monohydrated) | CAS # 5968-11-6 | 4.6 grams |
| Ilford Phenidone, 1-Phenyl-3-Pyrazolidinone | CAS # 92-43-3 | 1.1 grams |
Second prepare:
H&W Control Mixing Solution B
to
| Warm Water ( ~50ºC ) | CAS # 7732-18-5 | 50 ml |
add and dissolve
| Sodium Sulfite ( Anhydrous ) | CAS # 7757-83-7 | 8.0 grams |
Third prepare:
H&W Control Stock Solution
add and mix
| H&W Control Mixing Solution A | All from Step 1 |
| H&W Control Mixing Solution B | All from Step 2 |
then add
| Cold Water ( ~20ºC ) | CAS # 7732-18-5 | to make 132 ml |
Prepare:
H&W Control Working Solution ( 500 ml )
add and mix
| H&W Control Stock Solution | 29 ml |
| Cold Water ( ~20ºC ) | 471 ml |
Process at 20ºC with intermittent agitation for 14 to 18 minutes. Use working solution once and then discard.
Use with Bluefire Police, microfilms, and Kodak Technical Pan. Gives unacceptably flat images on ordinary films.
Shelf life of the concentrate is approximately six months in a full, tightly capped glass or PET bottle, less than one week in a partly full bottle. Refrigeration considerably prolongs shelf life. Normal color is pale yellow. Concentrate that has begun turning pink or red is oxidizing and should be discarded.