The water solution of iodine turn blue litmus paper to red.
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Iodine does not change the color of litmus paper. Litmus paper is typically used to test for acidity or basicity by changing color to red in acidic conditions and blue in basic conditions.
The color not change.
A base will turn red litmus paper blue.
Litmus paper will turn red when dipped in HI (hydroiodic acid) solution.
Red litmus paper is used to test for acids. If the red litmus paper turns blue when dipped in a substance, it indicates the presence of an acid.
Litmus paper would turn red if apricot juice, which is acidic, was dropped on it. This is because litmus paper turns red in the presence of an acid.