Curved Sine Wave

[Vincent Messenet]

Thanks to have authoring this part, I need 2 of it for the set 10255 - Assembly Square.

A question about the color choice. How do you choose the right color ?
Usually, I use a scanner and a small tool to found the right color. For this part the pink area is closer magenta with this method.

To be honest I rely on my sight and I compare Ldraw colors with pattern pictures.
But indeed I have some doubts about the colors I used for that part.