What to look for in correct case coloring

[Holeshot]

Here is an original 16 case and barrel colors. Kinda like oil on water.

[jeffkinser]

Thank you guys, the description and pictures were very helpful. It's not harsh lines and waves but seems to be more splotchy. I know those aren't technical terms but I think it is helping me recognize real vs. cyanide.

I appreciate the responses.

Jeff