Possible Clues:

• Colors
• Drunk Meg's pint with colourful types
• Drunk Meg's pint - a crafty mixture of the Black Stuff and water, for instance
• Colouring substances
• They give colour to oil, water, etc.
• They give colour to oil, water etc.
• Prehistoric inventions, as found in caves
• Eyeshades?
• Colours
• Colours in springtime perhaps lacking reds and indigos initially