This color scheme was forged using five threads, but it only takes an AMS to print it easily. All you need to do is replace any initial color with the final white to avoid interrupting the process.
You can use red or matte red. Using the matte version will give you a less intense color effect, but the result will still be stunning.

Print with a 100% infill rate, a layer height of 0.08mm, and a base layer of 0.16mm.

Consumables used:
BambuLab basic black PLA transmission distance: 0.6
BambuLab Basic Blue PLA transmission distance: 4
BambuLab matte scarlet PLA transmission distance: 2
BambuLab Basic Yellow PLA transmission distance: 6
BambuLab Basic Ivory White PLA Transmission Distance: 5

Color change instructions:
Starting with black
Change it to blue on the 8th layer
Change it to scarlet on the 12th layer
Change it to yellow on the 16th layer
On the 18th layer

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This color scheme requires the use of five consumables, but it can be easily printed with just one AMS. All you need to do is replace any initial color with the final white to avoid interrupting the process.
You can use red or matte red. Using the matte version will give you a less intense color effect, but the result will still be stunning.