I recall a short story, presumably written at the time of the US civil rights movement or the battle against South Africa's apartheid, about racism. One day, it started raining. The rain turned everyone's skin green. There was joy that we could no longer differentiate by skin colour, so discrimination and racism had to end. Until those with darker green skin gained power and started forcing those with lighter green skin to sit at the back of the bus...
Does anyone recognise this plot and could you provide the title and author? Thank you for any assistance.