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Hyposulfite residue cleaner

(with color indicator)


This formula has the function of avoiding the possible damages that the remains of hyposulfite can cause in photographic materials over time, if they were not washed correctly but above all, it contributes to an important saving of water,  Indispensable for the proper washing of films and barium papers.

Dramatically reduces the time and water of the traditional cleaning process, its  single-use working solutions and by containing a color indicator works like teas of  cleaning systems. Another of  Its advantages is the high performance by  its concentration, a bottle of 100ml can clean 400 films of universal pass or, 700 sheets of 18 x 24cm or similar area.

FORMULA (for 200ml of concentrate):

In 150ml of distilled water with a temperature between 18º and 28ºC:

1º.- Sodium Carbonate 24.0g
2º.- Sodium Hexametaphosphate 6.0g
3rd.- Sodium Hydroxide 24.0g
4.- Potassium Permanganate 2,0g
Fill up to 200ml. Filter and ready to use.


The working solutions are prepared with tap water and at the time of use in a container previously clean of hyposulfite (see cleaning of accessories).
  the drops of the cleaner (4 drops for each area equivalent to 18 x 24cm and in enough water so that the leaves can then be easily removed in a bucket) stir the liquid with something  plastic and clean  until  that the solution has a homogeneous and crystalline color. In that moment it will be ready to pour into the bucket.  and perform cleaning.

(if the solution became  cloudy, we must discard it, it has become contaminated).  

Cleaning sequence of barium papers in general (16º to 40ºC):

1º- 2 min. Rinse with tap water.
2nd- 4 min. In the continuous stirring cleaning bath.
3rd- 4 min. Wash in 4 rinses with clean water lasting one minute.


We must ensure that the papers are the time recommended by the manufacturer of the  fixative (no more, no less) to avoid hyposulfite saturation. If that is the case, increase the  cleaning sequence, but no  increase  the amount  of the cleaner.

Cleaning sequence for films (16º to 26ºC):

1º- ½ min. Rinse with tap water.
2nd- 1 min. In the continuous stirring cleaning bath.
3rd- 3 min. Final wash in tap water or 3 rinses with clean water for
  one minute.


In manual process; 6 drops of concentrate per film in the amount of tap water specified in the developer tank instructions.

JOBO rotary process; 4 drops of concentrate per film in the amount of tap water specified in the developer tank instructions.

With T MAX films, the indications in the table must be multiplied by three.

Accessories cleaning sequence:


1º- Rinse with tap water.
2nd- Approximately 1 min. Spreading the bath on all surfaces or introducing the object in it.
3rd- Approximately 1 min. Final wash in tap water.


Metal tweezers, cuvettes, test tubes, etc. Add 6 drops of the concentrate for every 1000ml of tap water to be used, clean 3 buckets of 18 x 24cm or equivalent area.

CHECK METHOD (Cleansing teas)

After the final wash (either from the cleaner's own process or from the ordinary wash that  we usually do) some of the test strips or one of the original ones are left in the cuvette (it will not be in danger) We add tap water until they are comfortably covered in the cuvette, let it rest for a maximum of 30 to 40 minutes, then shake several times  the cuvette before pouring water into one of the glass test tubes (clean beforehand). At that moment, the same amount of water is poured into a second cylinder but from the tap (approximately 100cc). In the cylinder of tap water we would pour several drops of the concentrate (until it takes an intense and crystalline color) in the same way in the cylinder as contains the  water from the bucket. We will observe for a minute  (no more) If the cleaning has been correct, the water in the two test tubes will have the same color and tone, if there is a difference in color, it is necessary to make corrections in the cleaning system because it has not been enough. In movies the tea is made the same.

For every 100ml of water for testing we can add approximately 4 drops of the
  concentrated. The two test tubes must contain the same amount of water and drops of the concentrate.


* In the case of washing teas on films and papers  that have been fixed with our Fixer (alternative F-2), 4 drops should be used per 100ml of water and the time  rest for color observation between the two test tubes should be 10 minutes, not less.

* Any method can be false if before or during the process, the samples were contaminated.

* The indicator in this formula can detect one (1) drop of Hyposulfite diluted in 75 liters of water.

* For any cleaning system that we use, it is only necessary to make the tea once  one time (if the result is  correct) always apply it with all the details of that experience.

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