0 Morty Asked: July 16, 2019In: Chemistry Why do things discolour when left out in the sun? 0 Why do things discolour when left out in the sun? In: Chemistry Share Facebook 1 Answer Voted SD_TMI Added an answer on July 16, 2019 at 8:25 pm The energy from the solar radiation (usually referred to as UV spectrum) energizes and changed or breaks down the molecules that either absorb /reflect different parts of the spectrum. Thereby changing what is reflected back at us and we sense as color. Oh damn it’s Explain it like I’m 5. Um, okay… It’s because the sunlight gives the colors sunburn. 0 Reply Share Share Share on Facebook Share on Twitter Share on LinkedIn Share on WhatsApp Leave an answerLeave an answerCancel reply Attachment Select file Browse Featured image Select file Browse What is the capital of UK? ( London ) Save my name, email, and website in this browser for the next time I comment.