Yarn burn test or Is it Wool? OR Why NOT to wear acrylic; especially for kids

I finally got out all the un marked yarn I had and tested it... I just happened to have the video camera with me.
Sorry up front for the quietness of my voice, I had to keep quite otherwise next doors dog would have started barking and you would not have heard a thing.

From You Tube description:

I have a whole heap of different yarn and don't know what it is made from.
I read plenty of different posts from around the interenet and tried to combine all the information into one and test some of the yarn I have.
Some say to smell, but I found some that burnt like acrylic and left the oil residue that acrylic is made out of still smelt like hair burning, but there are lots of different mixes and spun yarn available.
I certainly didn't like the way the acrylic burnt and can't even imagine being near an open flame wearing it... don't let your kiddies wear acrylic! As you can see...

This is what I had written down:

• If it acts dead it is a natural yarn
• If it acts alive it is a man made.
• If the yarn smells like burning hair - it is a natural fibre from an animal - it is also easy to put out- the residue will be an ash you can crumble (I found some that smelt this way, still had the left over oil residue, so I assume that there are plenty of "mixes" out there).
• If the yarn smells like a bonfire = it is a natural plant fibre -if it burns slowly after you take it away from the flame  you probably have silk
• If it practically ignites itself you have a rayon, rayon is made from wood pulp
• Acrylic and Nylon are man made fibres, made from petroleum products. They burn hot, smell like chemicals and melt like plastic, and hard to put out.

Links kept that I found some of the above information:
http://www.youtube.com/watch?v=6EeYdvDm4zE
http://jemajo-knitting.blogspot.com/2010/02/burning-issuebuyer-beware.html
Oh no! there were a few others but I don't know where I put the bookmarks.. sorry :( There is more information out there though :)

Here is the Video if you are interested to see the different yarns burn... In the end I was still unsure of a few, all I can put them down to is that different yarns had been spun together?






As always, would love to hear any further information/input :)