By the way, they are probably the most aggressive of the bunch. I protect a large number of birds, and almost every sudden death gets necropsied. Any sudden death is distressing, but most illnesses give some indication for a day of two of the problem. Birds die of stress, but generally, this is associated with laying or feeding hens. Other stress conditions, like lack of calcium also usually result in at least a day or two of obvious symptoms.
Colors are notoriously difficult to perceive and describe objectively.
They'll almost automatically open their wings when they feel the air lift under them, and pretty soon they're madly flapping away. I have gotten a couple good chuckles and been reminded of some great memories from recent posts to the lis from a new finchkeeper. It takes me back to my very first pair of finches. We have all been there. You read everything you can about them, buy them the best cage you can afford, throw in all the different kinds of nesting material the books tell you to and sit back watching them intently and wait for them to breed.