So I am setting an Excel cell\'s Interior Color to a certain value, like below:
worksheet.Cells[1, 1].Interior.Color = 0xF1DCDB;
However, when
I finally figured it out, after lots of tests, and it was something really simple. Apparently, Excel's Interop library has a bug and is reversing the Red and Blue values, so instead of passing it a hex of RGB, I need to pass BGR, and suddenly the colors work just fine. I'm amazed that this bug isn't documented anywhere else on the internet.
So if anyone else ever runs into this problem, simply pass Excel values in BGR values. (Or if using Color.FromArgb(), pass in Color.FromArgb(B, G, R))