Alas, I don't really "know" any thing about ink. It's one of those things you have to goof around with to get an understanding of :P
Yes, there is red and black here, and it's almost entirly washes (ink + water to varying degrees) I used a thin brush and a thick one. It's just like water color mostly; you just build layers until you get what you want.
Now I'm REALLY curious about how you use ink. With water? A brush? This looks very, very cool, and I am especially impressed with the shading. If you did this ALL with one bottle of red ink (though I think I see black in there, too?) I am truly impressed with your skills to make the ink go from dark red to pink. The pose in this picture is also quite nice, her expression is so soft and gentle. Please let me know anything you can about ink. I'll love you forever--really.