Therwen 30 Pcs Name Plates Laser Engraved Brushed Stainless Steel Plate Personalized Plaque Blank Custom Name Tag Frame Label with Adhesive Backing(Gold, Silver and Black Notched Corner,1''x 3'')

I have a 20w fiber laser. I did the gold one and I thought wow, this turned out great. It was black. Several hours later, I went to do another gold one, same settings everything and it barely left a mark. So I ran it a few times, could not get it to mark, even moving my laser closer to the engraving surface. Then I noticed, the one I did earlier, looked like it rusted, when I had it perfectly black.So then I tried the black one, kept getting a rainbow color, so upon suggestions in a laser group, I moved the laser up out of focus a few mm and increased speed, then I got a black one that went from copper colored to pink, ran it a few times and always the samething. Now the silver ones where the best. I personally wouldn't buy these again.My settings for the silver ones with a 20w commarker was 2000 speed/100 power/45freq and defocus( laser up 3mm) with a hatch of .004mmRun 2 timesFor white on the black(which took forever)Same as silver settings except a hatch of .001 ran 2 times. But let cool down.I do have to say that these settings are still not consistent with each plate.