I'm in the process of dying a pair of formerly cream hose a dark red. The hose are very bold in color now but my problem is that I don't seem to be able to get them as dark as I'd like. I've used scarlet Rit dye twice now, about half an hour to 45 minutes each time, in hopes of achieving a darker hue of red but to no avail. Do I need to add a drop of two of a second color to darken things up a bit?