The whole process and equipment of developing film.

How to develop black and white negatives

It is not very complicated to shoot with black and white film, and it is also very helpful to have a black and white foundation for color photography.

I suggest:

First, before buying black-and-white film, you must first find out whether you need traditional black-and-white film or "black-and-white" film with color technology. Its judgment is simple. If C4 1 is printed on the package (that is, color negative development process), it is a "black and white" film with color process (such as Kodak's T-400 BW). ); Others are traditional black and white films, such as Le Kai made in China and T-MAX made by Kodak.

Second, if you choose traditional black-and-white film shooting, you'd better get into the habit of going all the way:

First, the equipment used to develop black and white films is very simple, and there is no need for a darkroom.

2. The main equipment includes: a dark bag, a film-making tank, two containers for storing developer and fixer that can be replaced by mineral water bottles, plus a measuring cup, a stirring rod and a thermometer.

Third, the developer can be D-76 conventional developer. You can buy the prepared powder (estimated 2-3 yuan) at the photographic equipment store and mix it according to the instructions when you come back (of course, you can also buy the prepared concentrated solution, but it is not cost-effective for people who are not used to it); Fixing solution can be conventional acetic acid fixing solution (also buy powder and mix it back).

Fourth, Kodak TMAX can also be washed with D-76. Of course, if you are rich, you can use the TMAX special formula, but the result won't make you too excited.

5. After the above chemicals are mixed, you can roll the film into the film core of the film-making tank in the dark bag, then develop, stop, fix and bleach the film step by step, and then dry the film to develop and print it, and it can also be used for other purposes.

Sixth, you need to practice-first practice rolling in the light with waste film, and then be skilled in the dark bag!

Seven, need to pay attention to-is the development temperature and time!

Eight, if you are interested, you can try it now!

[Rammed tank]

Three: Precautions:

The development process is a chemical reaction process, and the speed and result of chemical reaction are related to external conditions, such as temperature and pressure.

Most users don't have temperature control equipment, so they will print films at natural temperature, so they need to pay attention to the printing temperature and time.

If a brand-new potion is at 20 degrees (referring to the temperature of the potion instead of room temperature! ) is 6-7 minutes, 24 degrees 4-5 minutes, 18 degrees 8-9 minutes.

The specific operation needs to be adjusted according to different formulas, the old and new degree of liquid medicine, the exposure of negative film and the expected contrast. Need to refer to the recipe instructions and do experiments. After a period of practice, you will easily master it.

In fact, almost 99% of photographers develop black-and-white films in this way-unless you use it to develop reverse films-in which case, you must send it to a printing shop that uses the E-6 process.

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