From what I've read, and from my experiences here, the digicam seems to take dye pretty easily. The two things to remember are:
1) you can only go darker than the existing color
2) whatever the original color is, it will effect the end color, there's going to be a slight mix of colors.
If you hold my para in the right light, the light part of the scale has a very slight green hue to it. The original digicam has some olive green undertones, I think the blue dye brought them out.
I'm considering putting it in the bath one more time, the pics actually bring out the blue a little better than real life. In real life, the scales aren't quite as bright blue as they look in person. I'm wanting to maybe darken the blue just a little bit.