You should watch the video first,it will explain everything.After that,if you want detali explaination,proceed to the next step.
Step 1: What you need to do
1.put the flour in the plastic bag
2.Depending on how big your camera is,put more flour if your cameara is big.
3.Make sure the plastic or surrounding is not wet
4.DO not add water into the flour
5.Use only plain flour in this experiment so that the surface remains smooth
6.Try to use plastic which are soft and easy to crush
To see how the plastic should be tied,proceed to the next step
Step 2: Tying the plastic
The proportion of flour to air should be 95:5
the reason why you have to leave some air inside so that the flour can be moved and mould arond easier
before tying,plan on the how big you want the surface to be