LPT Request: How to dye blend fabrics?

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The original was posted on /r/lifeprotips by /u/DM_ME_PUPPIES_THANKS on 2023-06-27 21:15:51+00:00.

I found my dream dress recently, but the problem is it only comes in white, pink, purple and blue. I ordered white and while I LOVE it, I also want to have it in black.

The plan is to buy another white one and dye it black. It's a blend fabric though (79% viscose 17% poly and 4% elastane). I know the dye made for natural fabric won't take on the poly so what to do?

Should I dye it with regular dye and then again with synthetics dye? I'm going for a very dark solid black colour.