1) They turn greenish Fe2- solution into reddish-brown solution of Fe3+ solution,
2) They turn a solution of H2S into yellow colouration of sulphur.
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 greenish Fe2- solution into reddish-brown solution of Fe3+ solution,
2) They turn a solution of H2S into yellow colouration of sulphur.