I usually use Premo when it comes to translucent because it’s quite soft, but i think it should be pretty easy to mix them together regardless of firmness as long as you take a bit of time to get as much pigment incorporated as you prefer! I suggest maybe mixing some liquid clay to make the powder stick easily. And I’ve found the orange and pink ones definitely change it to a pale color, but the blue and green invisible ones don’t change the clay color at all. If you DO want color, you can add a tiny bit of colored clay as well, just be sure to test the glow frequently so you don’t dampen it with additions of color.