I went a little overkill on the colors. I'm sure you can still get good results with just black, red, orange and yellow but the more shades the better blending!

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

Filaments Used:
PLA HATCHBOX BLACK Transmission Distance: 0.5
PLA HATCHBOX BROWN Transmission Distance: 2
PLA YEETIN MAROON Transmission Distance: 5.5
PLA YEETIN RED Transmission Distance: 5.5
PLA SUNLU RED Transmission Distance: 9.6
PLA HACKERSPACE DARK RED ORANGE Transmission Distance: 6
PLA HACKERSPACE ORANGE Transmission Distance: 10
PLA SUNLU ORAGNGE Transmission Distance: 10
PLA Generic Dark Yellow Transmission Distance: 12
PLA SUNLU YELLOW Transmission Distance: 12
PLA YEETIN PALE YELLOW Transmission Distance: 13

Swap Instructions:
Start with BLACK
At layer #9 (0.8mm) swap to BROWN
At layer #13 (1.12mm) swap to MAROON
At layer #14 (1.2mm) swap to RED
At layer #17 (1.44mm) swap to RED
At layer #18 (1.52mm) swap to DARK RED ORANGE
At layer #21 (1.76mm) swap to ORANGE
At layer #25 (2.08mm) swap to ORAGNGE
At layer #30 (2.48mm) swap to Dark Yellow
At layer #32 (2.64mm) swap to YELLOW
At layer #40 (3.28mm) swap to PALE YELLOW for the rest.