Buffalo- I think charcoal will absorb scent as well, so if its used in combo with EO's might want to watch out!
Ok here are some of my notes on this subject, I realize some may be on the other websites but I figured it would be good to have them all here in front of us to refer to!
Red Sandalwood- used in Ayurvedic medicine as an antiseptic and healing agent
COLOR: dark maroon, purple.
USE: 1 tsp/1 lb
Henna Leaf powder (ancient egypt), used as a refrigerant (cooling effect on the skin), astringent, antifungal, antibacterial
COLOR: Bright orange (infuse with oil and add to oils) WARNING: may transfer color to hair or skin.
Alkanet root powder
COLOR: dark red, purple tint
USE: infuse seeds in hot oils, strain.
COLOR: deep orange
Carrot root powder high in beta carotene
USE: 1-2 TBSP/lb
COLOR: creamy orange
Stinging Nettles Powder used as a natural deep cleanser especially for oily skin. encourages hair growth, stops external bleeding (good for use in shave soaps!!)
COLOR: natural green
Parsely powder Soothing, cleansing, detoxification, and heavy metal removal from body when ingested (includes cilantro which is in same genus), opens pores and good cleanser.
COLOR: natural green
USE: 1/2 tsp/ pound of oils
COLOR: nice green
I also inend to do some research on sea weeds (all types) as well as sea kelp, honey, varios roots and leaves of other plants and pureed veggies
Also I was thinking about adding clays to the soaps in order to color them, being that clay is inert it would be an excellent coloring agent, beware because every clay has different properties, some drying to the skin, some not...
here are some I looked into:
Bentonite, Dead Sea, French Green, Green illite, pink kaolin, red kaolin (1tsp/lb), white kaolin (good for dry/sensitive skin!!), yellow kaolin, multani mitti, moroccan rhassoil, rose clay (nice pink color), sea clay (dark green).
hope this helps!!
I may actually start a thread dealing with the topic of natural colorant additives/alternatives that would be a sort of how to with updates from my research...we shall see how it goes!