i recently sold my bottle of OPI "My Private Jet" holographic version and frankened a replacement using OPI Designer Series "Vintage" and China Glaze "Liquid Leather" (black jelly). as per the usual recipe i used about a 3:1 ratio.
the result was an (intentionally) warm black holo with golden shimmer from the DS "Vintage". as you can see from the photos, it is stunning. shown is 1 coat over 1 coat of black.