Oxidized jewelry has one job: stay dark in the recesses, bright on the high points. Most care advice online was written for plain polished silver, and following it on a blackened piece will undo the finish. We tested the common Reddit answers against what oxidized metal can actually take. Here is the sorting.
Advice that holds up
Keep it dry. Correct, and it is 90% of the job. Water itself does not kill a piece, but soap film and chlorine attack the darkened layer. Take rings off before washing dishes, pools are off limits, and the shower shortens the life of any finish.
Wipe with a dry cloth. Correct. A dry microfiber cloth after wear removes skin oil before it does anything. That is the entire maintenance routine.
Store pieces separately. Correct. Metal on metal rubs high points into scratches. A pouch or a separate box slot per piece is enough.
Advice that ruins the finish
Silver dip. The most repeated tip and the most destructive one. Dip solutions dissolve tarnish, and an oxidized finish chemically IS controlled tarnish. One dip strips it to bare bright metal. Never.
Ultrasonic cleaners. They shake dirt loose, and they shake the darkened layer loose with it, starting at the edges. Skip them for anything blackened, plated, or antiqued.
Toothpaste and baking soda. Both are abrasives. They polish, which is exactly what you do not want on a surface whose value is in the unpolished parts.
What normal wear does
Contact points lighten over months of wear. The raised edges of a thorn ring or the links of a cuban chain get brighter where they touch skin and sleeve, and the recesses stay dark. That contrast deepening is the finish working as designed, not wearing out. Fighting it with polish flattens the piece.
Full care notes ship on every product page under "Keeping it". The short version fits in one line: keep it dry, wipe it down, store it alone.