It was the 'colours' by Donovan, but it was indeed a much older song before he mangled, sorry, recorded it.... basically is was a song of praise for how beautiful the lady looked before she got up and put her makeup on.....

We always knew it as 'Red was the colour of my true loves' eyes, in the evening, when she's p***ed.....'

Yellow is the colour of my true loves' face, in the morning, hungover bad......

LTS