Julie, Twinkle has a pale green sheen on her breast and tummy. If what I've read is accurate, the green color is from bad breeding. Twinkle has pink eyes, but isn't a true albino. Piper has black eyes and is pure white. They are so tiny, they remind me of white mice.
Piper is usually the bravest of the two and that isn't saying a lot. They had a rough start. Straight from an aviary to a pet store where they were being stomped in the floor of a flight cage by about sixty birds, Piper and Twinkle were the only white birds in the cage, a lot of the others were English budgies. I couldn't leave them there. They were wild things for a long time. They are finally a lot calmer and both of them will hop on my finger, but they never stay too long, I'm hoping to change that, but they seem happy.