That’s gives ca 1 ml for the film.
In your original post, you said you used 3 mL of HC-110. I assumed you meant 3 mL of syrup. Circa 1 mL makes it sound like it was actually 3 mL of stock solution, which is 0.75 mL of syrup, or 1/4 the "real-world" minimum.
You could have got *something* on the film, even with only 0.75 mL of syrup. However, look at the chart to which the other poster linked. Look at the amounts of syrup that are mixed into the common dilutions. Published developing times are for much larger amounts of syrup than just a few mL.
For instance, take dilution B as an example, and let's say you have shot Ilford HP5 film (again, just for example).
Five minutes is the manufacturer's recommended developing time at 20 C. The chart sez that to make up 250 mL of HC-110 at dilution B, it takes approximately 8 mL of syrup.
There is a rule of thumb to find a starting point when experimenting with various dilutions: If you half the amount of stock, and keep the agitation intervals the same, you double the developing time to get the same contrast.
So, ignoring minimum syrup amounts just to make a point, figure it like this using the rule of thumb: If 8 mL of syrup develops the film in five minutes, 4 mL develops it in 10 minutes. Thus 2 mL develops it in 20 minutes. Thus 1 mL develops it in 40 minutes. You used 0.75 mL (I think). Since this is halfway to the next halving of syrup (which would be 0.5 mL), it is also halfway to the next doubling of time (which would be 80 minutes), thus 0.75 mL of syrup theoretically has a developing time of 60 minutes, *ignoring minimum syrup amounts*. This equates to 51 minutes in a Jobo, taking off 15% due to continuous agitation
Then, you have to look at the fact that once you go below 3 mL, the syrup is used up entirely once you get to a certain point. This kills your contrast by holding the highlights from developing past a certain density.
This is not technically accurate, but a little imagination might help to get the idea of how this affects your film. Think of it like this: If 3 mL is the minimum syrup amount you need to give you normal contrast, you will get half as much contrast with 1.5 mL, and you will get one quarter as much contrast with 0.75 mL. If your normal contrast index is 0.60, you end up with a contrast index of 0.15, even if you developed for 51 minutes (or forever, for that matter).
So, before you even developed, the amount of syrup you mixed in limited your contrast index to a certain level. (Ignore the 0.15 number above, as I pulled it out of my butt just to make a point.) Then, you add the fact that you developed using a listed time that was probably intended for dilution B or something similar. What was it? Five or ten minutes?
Underneath all of this, there is also the fact that the film is probably a bit underexposed if you used box speed and typical in-camera metering. This variance in EI typically ranges from 1/3 to 1 stop with most people's individualized testing.
Still, though: Are you sure there is *absolutely nothing* on your film?
