At first, I thought it might have been the light.
But you're right, those are colored...
I'm going to take a stab at this.....
Maybe an EXCESSIVE amount of B8?

Or maybe the paint layer is so thin that it only slightly interferes with the sound.
He said that they are "Harpy" cymbals. These cymbals originated in brazil and in 2006, renamed to Krest cymbals. They do indeed color there cymbals. Krest makes a variety of colored cymbals, like red, blue, and of course black. They have HC series, and LC series.
But Krest, no longer makes colored cymbals. They do have a lot of innovative qualities, like partially machine hammered and hand hammered cymbals. They have there own sound- edged hi-hat. Which they call them NAT hats. So with those qualities in mind, they saw the coloring doesn't alter the sound. But it seems unlikely.
They do look very unique.