Why Does Sweat Turn Shirts Yellow?

Have you ever gone through your laundry and noticed unsightly yellow stains in all of your white shirts? If your sweat isn't yellow, what's causing this? Hosted by: Hank Green ---------- Support SciShow by becoming a patron on Patreon: https://www.patreon.com/scishow ---------- Dooblydoo thanks go to the following Patreon supporters: Kelly Landrum Jones, Sam Lutfi, Kevin Knupp, Nicholas Smith, D.A. Noe, alexander wadsworth, سلطا الخليفي, Piya Shedden, KatieMarie Magnone, Scott Satovsky Jr, Bella Nash, Charles Southerland, Bader AlGhamdi, James Harshaw, Patrick Merrithew, Patrick D. Ashmore, Candy, Tim Curwick, charles george, Saul, Mark Terrio-Cameron, Viraansh Bhanushali, Kevin Bealer, Philippe von Bergen, Chris Peters, Justin Lentz ---------- Looking for SciShow elsewhere on the internet? Facebook: http://www.facebook.com/scishow Twitter: http://www.twitter.com/scishow Tumblr: http://scishow.tumblr.com Instagram: http://instagram.com/thescishow ---------- Sources: https://www.livestrong.com/article/107724-causes-yellow-perspiration/ https://www.thompsontee.com/blog/the-science-behind-your-pit-stains-and-what-to-do-about-it https://www.businessinsider.com.au/why-your-white-shirt-yellows-when-you-sweat-2016-4?r=US&IR=T https://www.nivea.com.au/skin-care-tips/deodorant/underarm-care/what-causes-sweat-stains https://health.howstuffworks.com/skin-care/problems/medical/chromhidrosis.htm http://c.ymcdn.com/sites/www.aocd.org/resource/resmgr/jaocd/contents/volume30/30-05.pdf https://www.gizmodo.com.au/2014/08/how-antiperspirant-works-and-who-it-might-hurt/ https://www.sweathelp.org/home/understanding-hyperhidrosis.html https://health.howstuffworks.com/wellness/men/sweating-odor/what-is-in-sweat.htm http://cenblog.org/artful-science/2012/02/27/sweat-stained-artifacts/