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   "found" old films.
 
 
+## Update 12-18-2021: Low Agitation With Dilute HC-110
+
+I wanted to see how super-dilute HC-110 behaved when agitated
+minmally.  Officially, the Kodak datasheet stops at 1:79 (Dilution
+F). But I wanted to see if very high dilution and minimal agitation
+worked well with this well regarded staple of the darkroom.
+
+For this test, semistand developed a roll of Arista 100 exposed at ASA
+100.  The film reel was elevated from the bottom of a Kodak 1/2 gal
+rubber tank with a stopper to try to keep it away from any residual
+bromide byproducts.
+
+1/2 gallon of HC-110 was diluted 1:128.  The film was prewashed for 3
+minutes then placed in the devloper.  It was initially agitated
+continuously for 2 minutes and then left to stand.  At 31 minutes,
+another 15 seconds of agitation was applied.   The film was removed
+from developer at 60 minutes and fixed/washed as usual.
+
+Findings:
+
+* The film developed nicely with no evidence of bromide drag and hit
+  full box ASA as one might expect.
+
+* Compared to Pyrocat-HD negatives, this seems to so very slightly more
+  grain (not surprising) compared to other ASA 100 films.  However, I've
+  not processed Arista 100 rollfilm in Pyrocat-HD so it could also just
+  be how the film is made.
+
+* The biggest thing I noticed is that super-dilute HC-110 has some
+  highlight compensating effect but it is noticeably less pronounced
+  than Pyrocat-HD.  I'd guess this is because of the lack of staining
+  effect.
+
+  One of the test scenes has deep shadows in a building directly
+  illuminated by late afternoon sun.  There was probably something
+  like a 13-15 stop subject brighness range.  Pycocat-HD would have
+  handled those highlights just fine, but the super-dilute HC-110
+  yielded a thick, dense negative.  It WAS printable and there WAS
+  detail in the highlights, so the highlight exhaustion inherent in
+  low agitation development definitely came into play.  It just wasn't
+  as pronounced a correction as I am used to.  (It made the negative
+  super fun to print with 100 seconds of soft light required to punch
+  through the highlight density.)
+
+Although this will never be my own daily driver, it would be useful
+for teaching low agitation - you likely don't want students poking
+around in catechol laced solutions until they understand what they are
+doing.
+
+As an aside, HC-110 and D-76 have very similar behaviours.  It might
+be fun to try super dilute D-76 some time.
+
+
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