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The technician said that the machine is sanitizing properly when the iodine sanitizer turns the color of the paper because the concentration is

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SeoJoon15
The answer is because the concentration of iodine sanitizer is immersed by the paper. If the paper has immersed in the iodine sanitizer, it could produce a color change-- where in, it could conclude that the paper has been sanitized properly as the color signifies that it has already been mixed with iodine, therefore, it has already been sanitized.

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