Pink patina on brass RPF Costume and Prop Maker Community

Hey folks, I'm having a bit of a problem. I'm doing some brass etching, but the end product will always have this pink patina to it. I've tried sanding it, polishing it with steel wool and scrubbing it to kingdom come with brasso but to no avail. The picture I'm showing had all three done to it

Mechanized: My prop collection (Updated: 7.8.20)

Brass is Pink not Yellow

REMOVING PINK COLOR FROM BRASS

How does one make a movie prop in do-it-yourself fashion? What materials are commonly used? - Quora

Help identifying Officer K apartment items from Blade Runner 2049

Spirited Away boiler token, Page 2

Hellboy Good Samaritan Build RPF Costume and Prop Maker Community

Jim Henson's Labyrinth - My Collection (Dec 2023 Update: Red

REMOVING PINK COLOR FROM BRASS

Jim Henson's Labyrinth - My Collection (Dec 2023 Update: Red