well, no idea but this is just a thought..maybe you can use food colors..thingies..the things they use on cakes and such, you can mix it with water and kinda dip them..in there..i guess..they sell blue and red and green and..alot of colors..and since those food color thingies are made from vegetable oil..(i think)..i wouldnt think it would harm a cpl of damsels..just a hypothesis!!!!..lol