3 ms·

I'm confused, if the fluoresce as shown doesn't that mean they look brighter in light visible to us? is it such a stretch to believe the birds can't see that?

• libria 9y ago
  Yes, fluorescent chemicals are distinctly included in laundry detergent for the same reason: to make the colors visibly stand out in daylight. As such, you can use laundry detergent to write "secret" notes visible under UV.
  • fenwick67 9y ago
    Also handy for Halloween props