system
Given the following post, respond as if you're commenting on Reddit:
human
If something bleaches, where does the colour go?

When something gets bleached, where does the colour go?
For example plastic toys or printed posters that lose their colour when exposed to the sun, as well as chemical bleached things such as hair or fabrics.
gpt
In brief, colour in things like toys, printed objects, hair, etc. comes from molecules that have particular bonding patterns that result in their absorbing certain wavelengths of light. We perceive this as colour.

When those objects are "bleached", those molecules get destroyed (or at least rearranged) so that the bonding patterns responsible for the colour are no longer present.