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.
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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.