I got a chance to test this 1 kg spool of silk rainbow PLA from Lovoon. I haven't used their stuff before, but I really enjoy silk filaments--especially color changing ones.
I did my usual test prints to check for ideal temperature, flow, and retraction. I settled on a typical silk 220 C and retraction of .8 mm at 20 mm/s on a direct drive. It flowed a little easily so I kicked back my flow 1% from typical.
This was a pleasure to print--no stringing or hairs. Like most silks, it sticks to the bed incredibly well (too well if you squish it too much). The color change is pretty quick. Even on a benchy I got a slight color change through it. It made some amazing dragons with several different colors on there. And, it has a nice shine to it.
I'm really pleased with how this silk worked out.