Hey guy, Aniline dyes work well, also you could try waterbase screen printing inks as they also come in various colours and can also be distressed later to give a aged look. Acrylic artist paints also work well and can be thinned in water to make it more penetrable. This paint has plasticizers and work well with polyurethane and minwax products. Try Craft Supplies USA at
www.woodturnerscatalog.com. Hope this helps.
Mortimer