@Sarah Stearns, Final Update: We Did a couple of far more shirts and allow them to sit during the baggage during the sun for 6-8 hours. Soon after rinsing, they however had a good level of coloration, but immediately after washing, they came out just as pale as the ones https://www.google.com/search?q=%ED%99%94%EA%B3%A1%EC%B6%9C%EC%9E%A5%EB%A7%88%EC%82%AC%EC%A7%80&oq=%ED%99%94%EA%B3%A1%EC%B6%9C%EC%9E%A5%EB%A7%88%EC%82%AC%EC%A7%80&gs_lcrp=EgZjaHJvbWUyBggAEEUYOdIBCDI1ODVqMGo3qAIAsAIA&sourceid=chrome&ie=UTF-8