Okay, this is a weird article to post on a marble board but a certain line in it made me think of past conversations ....
When Did Girls Start Wearing Pink?
When we think of pink marbles it's been proposed that the reason they may not have been very common in days of yore is that pink was for girls and marbles were mostly for boys.
Yet here is something which was said about pink in 1918:
The generally accepted rule is pink for the boys, and blue for the girls. The reason is that pink, being a more decided and stronger color, is more suitable for the boy, while blue, which is more delicate and dainty, is prettier for the girl.
For what it's worth! I found it interesting.