~*~How can a solar Speed Stacks cup change color?~*~?

Question

Because I have some and they say solar colored Speed Stacks cups have the ability to change color... and I haven't seen it change color yet...so please help me

Answer 1

I would imagine the cups would change color in sunlight.

Regular indoor lighting (incandescent and florescent) may not change the color of the cup because the light doesn't emit the right type of wavelength.

If the cup needs UV rays to change color this may be the reason you haven't seen it change color.

Also try with the cup outside, some windows may not allow UV light to penetrate therefore not allowing it to change color.

Answer 2

Most normal plastic cups will stick together, but you could try drilling a few holes in the base of the cups to let the air through. You could buy "Race Cups" which are a cheaper version of speed stacks as well.