been reading The 7 keys to Colour Healing by Roland Hunt, recommended by Jon Whale who makes electro gem healing machines for 15 – 20 years now. I had a golf ball size hernia around right pubic area and 2 20 min sessions on his lamps cleared that up for 2 weeks which amazed me. Need another session to finish it off.
anyway, for what it’s worth, this books has
Copper radiates: red, yellow, green, blue, indigo
Titanium, the same plus Violet
Aluminium: yellow, green, blue, violet