Because I have some and they utter solar colored Speed Stacks cups have the propensity to change color... and I haven't see it change color but...so please help me
Answers: I would interpret the cups would change color within sunlight.
Regular indoor lighting (incandescent and florescent) may not change the color of the cup because the street light doesn't emit the right type of wavelength.
If the cup wishes UV rays to change color this may be the justification you haven't seen it loose change color.
Also try with the cup outside, some window may not allow UV light to gain access to therefore not allowing it to coppers color.
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Answers: I would interpret the cups would change color within sunlight.
Regular indoor lighting (incandescent and florescent) may not change the color of the cup because the street light doesn't emit the right type of wavelength.
If the cup wishes UV rays to change color this may be the justification you haven't seen it loose change color.
Also try with the cup outside, some window may not allow UV light to gain access to therefore not allowing it to coppers color.
More Solar Questions & Answers...