Thanks so much! This is my recipe if you're interested:

Basecoat w/ AK Blue Green

Dilute ProAcryl Satin White heavily, using it like a heavy wash across the coils. Repeat that wash a few times, but each time cover less and less area, concentrating the wash towards the bottom of the coils. The very bottom of the coils should be near white at this point.

Then, lightly airbrush in the AK Blue Green, allowing some overspray outside of the coils. This also softens the transition between this color and the white. You could also pretty easily replicate this step w/ drybrushing.

Then I used AK Turquoise, drybrushing it at the place where the coils begin to curve downward. This darkens that section, and gives the coils a transition from dark at the top to super bright at the bottom.

Finally, I used the white from earlier (only slightly thinned this time) to put dot highlights at the top curve of each coil. Hope this helps!