Clearing bath formula

In the Formula section of the Cookbook, only one bleach bath and one clearing bath formula is given, Bleach Bath DW-1 and Clearing Bath DW-2. Use both of these with any of the three developers given under Reversal Processing. 

Place the uncovered beaker on a hot plate, and heat the contents vigorously until the center of the bottom of the beaker becomes clear. Remove the beaker, and cool to room temperature. Add 5 mL of hydrochloric acid, and heat again until white fumes evolve. After cooling, dilute the solution to approximately 100 mL with water, adjust to pH 6 0.2 with 10% sodium hydroxide, and heat the solution to boiling. Add 15 mL of 10% barium chloride solution, and leave the solution overnight in a fresh beaker in a steam bath at 90° to 95°. Filter through ashless filter paper (Whatman No. 42, or equivalent), and wash the precipitate with 200 mL of warm water. Transfer the paper and precipitate to a tared crucible. Heat the crucible slowly on a Bunsen burner to expel moisture. Place the crucible and contents in a muffle furnace at 850° for 1 h. Let the crucible cool in a desiccator, and then weigh the residue to the nearest 0.0001 g. Calculate the percent of sulfonate sulfur by the formula... 

Assay Mix 50.0 mL of sample with 500 mg of tartaric acid, shake for 5 min, and filter. Dry the filtered oil over anhydrous sodium sulfate, and then pipet 10.0 mL of the clear, treated oil into a 150-mL cassia flask. Add 75 mL of a 30% solution of sodium bisulfite, stopper the flask, and shake until a semisolid to solid sodium bisulfite addition product has formed. Allow the mixture to stand at room temperature for 5 min, then loosen the stopper, and immerse the flask in a water bath heated to between 85° and 90°. Maintain the water bath at this temperature, shaking the flask occasionally, until the addition product dissolves, and then continue heating and intermittently shaking for another 30 min. When the liquids have separated completely, add enough 30% sodium bisulfite solution to raise the lower level of the oily layer within the graduated portion of the flask s neck. Calculate the percentage, by volume, of the citral by the formula... 

The above mechanism was able to explain easily the cause and give the means to avoid this hot run . It is clear that silicon can be consumed by the hquid alloy with the rate less than or equal to the rate of the reaction (4.2). This maximum possible rate is equal to about 2 x 10 g cm h. This number determines the upper possible rate of silica input into the bath that must not be exceeded to avoid the hot run . Also it is clear that the upper limit exists for the concentration of silicon in the product alloy. For a particular cell, it can be estimated from the formula ... 

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