Rapid fixers

The films were then developed for 5 min at 20°C in Kodak liquid X-ray developer, rinsed in 3 acetic acid and fixed for 10 min in Kodak Rapid Fixer. 

Paper agitation depends on the method of fixation Kodak Two-Bath or Ilford Single-Bath with Rapid Fixer (see Fixing Paper, above). If the two-bath method is used, agitate for 30 seconds each minute. If using the single-bath method, agitation should be continuous. 

The minimum fixing time is twice the time it takes the film to clear in fresh fixer. With some concentrated formulas such as Ilford Rapid Fixer or Photographers Formulary TF-4 the film may be clear in 15 to 20 seconds. Even so, I recommend a minimum fixing time of 3 minutes for all films and fixers, except for those that are meant for extremely rapid fixing, such as Defender 9-F Thiocyanate Fixer. This is not a scientific recommendation—it is my recommendation. One extra minute or two of fixing time will not adversely affect the film and it will help insure complete fixation as the fixer ages. 

Re-fix the negatives in rapid fixer without hardener for 1 minute. 

Fix in rapid fixer for 1 Vi times the time required to clear, which should be approximately 4 minutes at 60F/16C or 8 minutes at 40F/4C. 

Acid Hardening Rapid Fixer (Donald B.Alnutt)... 

Dilute 1 part of rapid fixer containing hardener with 2 parts of water. To each liter of the diluted fixer add 15.0 grams of citric acid, anhydrous. 

Rapid-fixer (Kodak without hardener), prepared according to manufacturer s instructions... 

Digoxigenin-labeled slides are not counterstained to ensure that stain does not obscure detectiou of the digoxigenin sigual. Nonetheless, sections exposed to the Kodak Rapid fixer turn a faint purple and may appear as if they have been Nissl-stained (6). The color of fiber tracts is not altered. 

---