8g potassium hydroxide dissolved in 300mL water.
Add 10g glucose.
For blue to clear:
When dissolved, add 2 to3 squirts methylene blue.
For blue to pink:
Also add 2 to 3 squirts phenolphthalein.
For blue to yellow/green:
Also add lots of fluorescein.
Pour into a 1 litre volumetric flask or a jar and shake.
If the reaction starts to slow, take the top off to allow more oxygen in.