HC-110 development times: dilution B for Tri-X, T-Max and Plus-X

The sheet's last temperature header reads "24°F". That is a misprint for 24 °C (75 °F): the other four columns are 18, 20, 21 and 22 °C, and a 24 °F developer would be below freezing. I read the column as 24 °C.

Kodak lists three different Tri-X entries, and the times are far apart. Tri-X Pan / TX takes 7:30 in a small tank at 20 °C, Tri-X Pan Professional / TXP takes 5:30, and Professional Tri-X 400 / 400TX takes 3:45. Look at the name on your box before you pick a row. If you can't tell which one you have, the sheet doesn't say how to decide, and a test roll will.

Verichrome Pan's small-tank time at 24 °C is printed as 2 minutes, where the neighbouring cells step down by half a minute. It may be a misprint, and I copied it as printed. The sheet also prints Technical Pan only as a pointer to a separate publication (P-255), so that film has no row here.

J-24 also prints dilution B times for sheet film in trays and large tanks, a rotary-tube table, and T-Max P3200 times by exposure index. I left those out to keep the page short, so check J-24 if you need them.

Under the roll-film table Kodak prints: "Tank-development times shorter than 5 minutes may produce unsatisfactory uniformity." In the small-tank table, 8 of the 11 films have at least one time under 5 minutes. Professional Plus-X 125 is under it in all ten of its times, and Professional Tri-X 400 / 400TX in nine of ten.

My guess at why it matters: a short time leaves little room for pouring in, the first agitation and pouring out, so a few seconds are a large share of the total. A cooler developer lengthens the time, but the 18 °C column is the longest Kodak offers, and for 400TX it is still 4:30 in a small tank. The sheet suggests no other fix.

Kodak handles temperature by printing a separate time for each of five temperatures. The sheet gives no formula and no correction factor. The 10 to 32 °C range it mentions is for mixing the solution, and the developing columns stop at 24 °C.

For a temperature between the columns, or beyond them, the temperature calculator will give a number, but it is a curve fitted to Ilford's chart and not to Kodak's. For Tri-X Pan in a small tank, taking the 20 °C time of 7:30, it gives 6:09 at 22 °C and 5:08 at 24 °C. Kodak prints 6:00 and 5:00. When the sheet has your temperature, use the sheet.

J-24 names six dilutions. From the concentrate they are A 1:15, B 1:31, C 1:19, D 1:39, E 1:47 and F 1:79. The sheet's development tables cover A and B for roll film.

"Dilution H" (1+63) is a name you meet in photo forums. It is not in J-24, which stops at F, so Kodak prints no time for it and this page shows none. If you use it, you are working from someone's own test, so run a test roll. The dilution calculator handles the mixing for any ratio if you enter 63.