The first little job was a burn test on some fabric I purchased from Spotlight that was just marked "fabric/textiles". I suspected one was polyester from the handle and feel of it, but the other felt that it might have a natural fibre (cotton or viscose - probably soft cotton/mix).
I just do burn tests now without too much thought, but if you want to find out what to do, just google "fabric burn test"and you will find lots of information on what to do.
White - Probably polyester. Fused quickly, melted away from flame, and hard edge afterwards
Purple - a natural fibre in this fabric - much softer ash residue, crumbles. Feels soft at the burn edge. Has not melted as it burnt (you can see that it was burning in and not melting away - compare with the white edge).
The next little test: I will be making a dress soon out of four different colours. When I mix colours in a garment, I always test for colour fastness first.
To do this, I snip a strip of fabric. I then put it in a little container and immerse it in boiling water and watch to see if it bleeds colour. Then I lay the strip out on a paper towel (or two, as the strips are a bit wet!).
If the colour is running at all, you will find evidence under the fabric strips. I have turned these over, and they are not running - the black has left a slight trace, but as these colours will not really be affected much by a tiny bit of black, this garment will be safe to wash with four colours. And I will be washing it in much cooler water than boiling water :)
And my third test - checking that poly cotton bias binding that I want to use is pre-shrunk
It's the boiling water trick again. Mark the edges of your bias tape on a piece of paper, remove the strips, dunk them in boiling water for a few minutes, blot out water and replace on the paper. If they match the marks without any shrinking - then you can assume that the binding will not shrink with normal washing.
Have a great week everyone,