This custom, 1:1 ratio blend was mixed by a member on the Fountain Pen Network forums. I thought that it made for a nice, dark red blend with some solid tones and nice shading.
This scan was done on an HP Deskjet F4280 at 600dpi.
Note: Because these scans are done with a light emitting printer, actual colors will, more likely than not, be slightly darker than they may appear, here. The colors shown, here, are probably a bit more reminiscent of what the ink would be like under a bright light or if it were held up and viewed with a light behind it.