Heh, well remember the target audience is kids in grades 7-12. Most kids do not understand hexadecimal so I am not too thrilled at the prospect of having to teach them that.
Especially when the Scene Setter we have displays values in decimal, and so they'd need to do conversion on the fly in the head. Ugh.
What I'm really looking for is a picture book showing images of three physical sliders set from 0-255 for each color, with a number below the slider showing the value.
This way it becomes a simple process of, look up color, set the three sliders to roughly match the printed slider picture, and fine-adjust to match exact slider values if desired.