What do you need to play in a darkroom?

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Let me send out the purpose of these things. ...

glass beaker

(1) This is a glass beaker with a capacity of 1000ml (ml), because each black-and-white photographic development formula is based on 1000ml. When washing, we can use this beaker to prepare the liquid medicine, and we can also use it as a container to hold the liquid medicine poured from the developing tank, because it is generally much faster to fill it than to pour it into the liquid medicine bottle, and at the same time we can clearly see the turbidity of the liquid medicine and the loss of the liquid medicine. This kind of glass beaker is mostly sold in glass instrument stores, and the price is generally more than ten yuan. Most of the measuring cups commonly used in photography shops are plastic products, such as non-imported brand-name products, which are not too expensive, but have small capacity and are easy to use, but they are not as good as glass in cleaning, and the water temperature is too hot and easy to deform. If these two things are hard to buy in your place, you can find a calibrated saline bottle instead.

balance

② In front of me is a rack balance with a maximum weighing of 250g, which is an important tool for weighing drugs. Although the balance used to prepare washing drugs need not be as accurate as the advanced precision balance, it should be able to weigh at least 0. 1 g of chemicals. When weighing fixed drugs, a larger scale (such as 500g) may be more useful than a small scale, but the price may be much higher. If the problem of buying a balance there is not easy to solve, it can also be replaced by "gram". It is not necessarily cheap to buy a high-quality balance.

Small beaker

(3) This beaker is used to measure small doses of liquid medicine. Generally, the capacity of 150ml is enough. When preparing acidic fixing solution, such a small beaker must be used, otherwise directly pouring high-concentration glacial acetic acid into a large beaker filled with sodium thiosulfate will lead to turbidity or even failure.

Stirring liquid medicine

This special glass rod should be used to stir the liquid medicine, because the chemical stability of glass is excellent. But the disadvantage of this article is that it is fragile, so be careful when using it. In fact, finding an unpainted bamboo chopstick can also replace this glass stick, but because bamboo and wood products have adsorption function, one should be used separately for development and fixation.

thermometer

This is a thermometer for measuring the temperature of liquid medicine. It is a very important product of film development, which is directly related to the quality of film development. Do not buy inferior products. Thermometers have two functions: one is to measure the water temperature when dispensing medicine; The second is to monitor the temperature of liquid medicine during film development. There are two kinds of glass column thermometers, mercury medium is more accurate, but its display is not obvious, and there will be some danger (mercury poisoning) after rupture; Alcohol medium is generally poor in accuracy, but the display is clear and the price is cheap; The pointer of a special thermometer made of metal is the most intuitive, but this product is also the most expensive, and its accuracy should be tested frequently. When the thermometer is inaccurate, the following methods can be used to determine its error, so as to correct it in use: take a cup of warm water between 30 and 30-40℃, and put the developed thermometer and a thermometer with a minimum mercury column into the cup at the same time until the thermometer no longer rises, so as to see if there is any error in the developed thermometer. It doesn't matter if there is an error, just remember to compensate when using it.

Sealed liquid medicine

⑥ The prepared washing liquid must be stored in a completely sealed container with stable physical and chemical properties. These are two ground glass bottles, which are used to hold washing liquid. The dark brown one is filled with developer, because the developer will be oxidized by strong light. Colorless is a bottle of fixing solution, which is used to distinguish developing solution. Other dark glass bottles or plastic bottles can also be used, but they must be sealed to prevent oxidation or liquid medicine leakage.

Developing pool

⑦ This is the "protagonist" of developing film by hand in the bright room. We have to put the film inside, and then pour the developer or fixer in through the dark groove outside. There are two types of developing tanks: tank type and tape type, and two different products, stainless steel and plastic, which will be introduced in detail in later chapters. If you can't buy a developing tank at the moment, I'll also introduce you to the method of developing film in the darkroom with a developing plate or even an ordinary rice bowl or soup plate.

Camera bag

⑧ Dark bag (also called darkroom bag) is a convenient tool for you to safely load the film into the developing tank in bright environment. This kind of article can be bought in a photo shop or made by yourself, but it must be made of materials that can absolutely avoid light, such as opaque black satin, nylon, woolen cloth, etc. If you have a darkroom that is well protected from light, you can also omit this dark bag and disassemble the film directly in the darkroom.

chimney

Pet-name ruby This is a plastic funnel, and its function must be known to everyone, that is, it will be more convenient to pour the medicine into the bottle. If you put a piece of absorbent cotton or qualitative filter paper on this funnel, you can also decant some impurities in the liquid medicine. There are also enamel and glass products in the funnel of potion, but enamel is easy to rust and glass funnel is easy to break. Emergency measures can be replaced by cutting the bottle mouth of plastic beverage bottles, or folding plastic sheets or even thick paper into funnels to solve urgent needs.

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