Combine flour and salt in large, microwave safe bowl.
Make a small well and add the oil and food colouring.
Pour in warm water and combine well.
Microwave on high for 30 seconds.
Tip mixture out onto a lightly floured surface.
Leave for 4-5 minutes.
After this time if the dough is still sticky, add a little bit more flour and work it into the dough.
Knead and work the dough until it becomes soft and manageable and a nice ball of playdough.