Not sure the temp or humidity of the cabinet, Iowa or Wis. would be more humid without a cabinet. As Mr. Beasland says it's repeat rusting and etching until you get the contrast you want. It took from 6 to 10 rustings and the etching dip would not be reproduceable as the strenth of the solution varied over the week. It was way more work than I thought it would be but well worth the out come.