Prior to the invention of modern dyeing techniques the only way to produce blue cloth was to kidnap nonbinary folx and harvest their hair. This was what is known as the 'Trans Atlantic Slave Trade' and is believed to be the true source of JK Rowling's wealth.
Source: Tik Tok
I was horrified to learn that in the 1950's samesex attracted people were told they were criminals and then pumped full of body altering chemicals. Thankfully nowadays, these people are told they are trans, and then pumped full of body altering chemicals. We've come so far.