Only information I have is for the Cubs, but when they first went into production lifts and implement were blue, with them going to red in 48. Since red requires quite a bit of pigment, and during wartime everything was in short supply, blue would have been logical.
"The Constitution is not an instrument for the government
to restrain the people, it is an instrument for the people to restrain the
government lest it come to dominate our lives and interests." Patrick Henry