Bob Coon

12-Sep-2009, 23:05

I am new to developing 4X5 film (having sent out for lab development in the past to just get underway using a 4X5) Now I am turning my attention to development at home. And am a bit confused.

Using Kodak T-Max 400 film

Developing in T-Max RS

Develop 5 minutes at 75F

Kodak's literature is all about time and temps and a bit lacking on the mixing of stock and working solutions from the A and B chemistry.

My question: What is the correct mix for Stock and the correct mix of that Stock for a Working solution? I seem to have found 3 different options and need some help putting together the details.

so... do I

Mix A+B together for stock (no water).

For usage, dilute 1:9 with H20 for working solution.

Making about 10 quarts total.

e.g. - Dump the little bottle into the big Kodak bottle - add 100 ml from that Kodak bottle and add water to = 1 liter for usage.

or...

Mix A+B together add H20 to make 1 gallon of stock.

For usage dilute 1:9 with H20 for working solution.

Making 10 gallons total.

e.g. - Dump the little bottle and big bottle together add water to one gallon - then take 100 ml from that gallon add water to = 1 liter for usage.

or...

Mix the A+B together add H20 to make 1 gallon, then divide that into two 1/2 gallon containers.

For usage, use one 1/2 gallon for development returning used developer back to bottle replenishment style.

Add in from 2nd bottle at a rate of 1.5 ounces per (one 8x10 sheet or the equivalent of four 4x5 sheets, or one roll of 135-36) processed. (meaning the 1/2 gallon grows in volume eventually reaching a full gallon right?)

When the second half gallon is used up the developer is exhausted and ready to be replaced.

-?-

Each of these scenarios have very different dilution outcomes. Which is it? Can anyone shed some light (pardon the pun) on the subject?

Thanks in advance.

Using Kodak T-Max 400 film

Developing in T-Max RS

Develop 5 minutes at 75F

Kodak's literature is all about time and temps and a bit lacking on the mixing of stock and working solutions from the A and B chemistry.

My question: What is the correct mix for Stock and the correct mix of that Stock for a Working solution? I seem to have found 3 different options and need some help putting together the details.

so... do I

Mix A+B together for stock (no water).

For usage, dilute 1:9 with H20 for working solution.

Making about 10 quarts total.

e.g. - Dump the little bottle into the big Kodak bottle - add 100 ml from that Kodak bottle and add water to = 1 liter for usage.

or...

Mix A+B together add H20 to make 1 gallon of stock.

For usage dilute 1:9 with H20 for working solution.

Making 10 gallons total.

e.g. - Dump the little bottle and big bottle together add water to one gallon - then take 100 ml from that gallon add water to = 1 liter for usage.

or...

Mix the A+B together add H20 to make 1 gallon, then divide that into two 1/2 gallon containers.

For usage, use one 1/2 gallon for development returning used developer back to bottle replenishment style.

Add in from 2nd bottle at a rate of 1.5 ounces per (one 8x10 sheet or the equivalent of four 4x5 sheets, or one roll of 135-36) processed. (meaning the 1/2 gallon grows in volume eventually reaching a full gallon right?)

When the second half gallon is used up the developer is exhausted and ready to be replaced.

-?-

Each of these scenarios have very different dilution outcomes. Which is it? Can anyone shed some light (pardon the pun) on the subject?

Thanks in advance.