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The color Neon City is a PLA Silk Dual Color from BambuLab.

You can also use any kind of purple for this.

e.g. Lavender Blue from BambuLab

Print at 100% infill with a layer height of 0.08mm with a base layer of 0.16mm

Filaments Used:
PLA BumbuLab Matte Charcoal Transmission Distance: 0
PLA BambuLab Neon City Transmission Distance: 4.8
PLA BambuLab Magenta Transmission Distance: 4
PLA BambuLab White Transmission Distance: 9.6

Swap Instructions:
Start with Matte Charcoal
At layer #12 (1.04mm) swap to Neon City
At layer #16 (1.36mm) swap to Magenta
At layer #20 (1.68mm) swap to White for the rest.