Work preferably at a temperature between 15 and 25 degree C (more time is required for lower temperatures).
When the steel contains no molybdenum the colour does not change (during the first minutes).

While RXSOL MIX Reagent gradually turns to brown in case of steel with more than 0.15% of molybdenum.
When the molybdenum value is higher than 1.5%; the reagent turns to intensive brown cholocate.

Browning speed increases with molybdenum content;  In the 18/8 standard steels, it’s recommended to make comparative tests on the two MO material is distinguished by its lower reactions rate.

In that case, the user has to clean the spatula between the two tests. The reagent easily characterizes nickel-molybdenum alloys of hastelloy B type, with very high molybdenum content. The colour becomes clearly brown after 5 minutes. It has not effect in the case of nickel-molybdenum-chromium alloys of the hastelloy C type.