Good answers guys, but not really what she was asking. To increase contrast you must: increase time in dev., increase agitation, increase dev temp., or all three.
Yeah, that's pretty much what we said.
All films will have higher contrat when developed longer, regardless of developer.
Using film since before it was hip.
"One of the most singular characters of the hyposulphites, is the property their solutions possess of dissolving muriate of silver and retaining it in considerable quantity in permanent solution" — Sir John Frederick William Herschel, "On the Hyposulphurous Acid and its Compounds." The Edinburgh Philosophical Journal, Vol. 1 (8 Jan. 1819): 8-29. p. 11
I'll echo MHV and suggest copy film, if you don't mind the film being orthochromatic. Very responsive to increased development (by temp, time and agitation) as well as exposure. But it is not cheap either. Ilford make a nice one in sheets -- don't know if it is availible in rolls.
I have used both Kodak and Ilford copy film with HC-110 and have been able to get as much contrast as one could possibly want...and more.
At least with LF landscape, a bad day of photography can still be a good day of exercise.
It is easy to get high contrast with Ilford Pan F, readily available in 120, but not 4x5. Just underexpose and overdevelop and the contrast skyrockets. This is true to a certain extent with any black and white film, but more so with 100 speed and slower films. If you are busy, as I am sure you are with a 4 month old, why not just try some film that you already have and just underexpose and overdevelop, if you get close to what you want just add a little more aggressive agitation.
Consider Lith film - red blind, develop by inspection under safelight. ASA about 3-6 under daylight. When not developed in lith developer, it is capable of grey scale- consider a more dilute developer as a start , like HC-110b 1:1 .
It is also very cheap - buy some 8x10, etc, and cut it down to 4x5 in your darkroom, just like paper under safelight. It is also very fun to use in manipulating images to high contrast in the darkroom at higher developer concentrations.
Adox CMS20 is not available in type 120 or sheet film.
It's not? Phooey, I was just getting interested.
Adox ORT 25 is available in both and can give nice contrasty results without extraordinary treatment. I've played with it in Diafine and Caffenol LC+C, which not unnaturally give very different contrast (example of each attached---the landscape is Diafine). Neither is at the extreme you see with something like Tech Pan, though.