1) They turn KMnO4solution from purple to colourless,
2) They turn KCr2O7 solution from orange to green.
3) They turn reddish brown Fe3+ solution to greenish solution.
search-in-place domain was triggered too early. This is usually an indicator for some code in the plugin or theme running too early. Translations should be loaded at the init action or later. Please see Debugging in WordPress for more information. (This message was added in version 6.7.0.) in /usr/www/users/mywaecf/KEYPOINT/wp-includes/functions.php on line 61211) They turn KMnO4solution from purple to colourless,
2) They turn KCr2O7 solution from orange to green.
3) They turn reddish brown Fe3+ solution to greenish solution.