Learn how to cancel Black Light subscription on iPhone, Android, Paypal or directly.
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Alternative method via AppStore:
1. Black Light is a simulator of real black light.
2. In the app you can change and select the TONE of color that you want (Deep purple variations), the TIME that you want the screen will be active and the BRIGHTNESS of your screen.
3. "Black light" is only for fun and doesn't produce real black light, "Black light" just mimics the color of a black light.