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:
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.
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