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Updated: July 12, 2026
The plate should be coated over the dry iodine to a red just bordering on a slate, and then exposed to the mixture only sufficiently long to change the color. If this is not done in less than six seconds it is not strong enough. Re-coat over the iodine full one fourth as long as first coating." This exceedingly volatile compound is difficult to control from its instability; it is but little used.
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