How do I know if the fabric is cotton?
Do a burn test – I know that sounds dramatic but we aren’t suggesting you set your stash alight!! In essence, cotton fibres ignite as the flame from your match draws near Synthetic fibres curl away from the heat and tend to ‘melt’. Take a few fibres; put into flameproof container with sides maybe, and apply a small flame from a long handled match maybe, and watch what happens.