No, I’m using a concentrated solution called "Triple ammonia" it is a 25% W/W solution of ammonia in water. (Sold for domestic use, since there is no reason to pay for water, when it's so much cheaper to tap it and dilute it yourself).
A commercial test for domestic use is just two small bottles of respectively 1% DMG in ethanol and 5M ammonia solution.
If this method is positive, it only shows that the object is able to give of nickel in an amount that may cause problems with allergy.
300 series steel contains lots of nickel, but will test negative when subjected to this test.
If you want to test steel, I think you will have to apply a drop of AR to it, maybe heat a little, then make it alkaline with ammonia and add the DMG.