Originally Posted by
Flying Lawyer
Don't they change the colours?
I don't believe so; I'm quite sure that the ATM printed tickets stayed the same after the last price increase. Just the printed price has changed.
I googled the situation after the last price increase in January 2017 - there you only had 14 days to use old tickets and a few weeks to get an upfare ticket.
So it seems your older tickets are only good as long as there has been no price increase.