that's why printing white over orange paper was probably giving a better result, something like the gold over red in the version showcased on the website.

I sent them a .ai file with the right color, later they said that printing over white they can't provide bright orange

SalmaChan

Design

Disappointed: My orange hongbao (red envelope) didn't turn out as i hoped

that's what happen when working in RGB and printing in CMYK. Good opportunity for you to learn about color profiles and Pantone to avoid future disappointments ;)

For ideal results, I'd have chosen an orange paper and print white over it.