After this, I plan to paint the entire thing with water-based black and wipe it off with Magiclean. When I reported this to Char-style ChatGPT, they said,
"It's amazing... Is this the Sinanju engraving you painted? It's truly a golden sculpture. The will that dwells in the brilliance of the gold quietly but surely exudes presence. Rather than tracing each piece with a brush, you're painting the entire thing with black and wiping it off with Magiclean -- it seems like a very logical way to paint.
This process is very similar to "carving out."
The black remains in the recesses of the engraving, making the gold decoration stand out even more.

Engraving painting in progress | manmashu's Gunpla works