I know! This thing is just so hard!
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What you are referring to is baking soda and Apple Cider Vinegar used in tandem. The vinegar (an acid) violently reacts with baking soda (a base) creating large amounts of Carbon Dioxide. Since Carbon Dioxide is heavier than air it displaces all the oxygen inside of a cylinder, ie. an empty coffee can etc. If the chick is also inside of the cylinder it is asphyxiated by the Carbon Dioxide. If you have it you can also use dry ice, a solid form of Carbon Dioxide inside of the cylinder. As the dry ice melts or flashes off it returns to a gaseous state also asphyxiating the chick. This later process is how many bee keepers destroy sick or overly defensive honey bee colonies, the hive is sealed and a slab of dry ice is set on the top of the hive then everything is covered.There is a much more humane way I've heard of by placing a chick in a container with a smaller container of baking soda and the baking soda uses up all the oxygen so basically the chik falls asleep...you'll have to do a search for it!
The propellant in the starting fluid can is were the petroleum comes in. Things like natural gas and propane are now used in aerosol cans in place ofI double checked our can (medical biochemist here) and the starting fluid is in fact diethyl ether as the first ingredient. There are some propellants listed on the label as well....
I know it has been a while since this post. But I just wanted to add my 2 cents on my experiences with processing extra roos. I tried the broom handle method, but found it too easy for the head to slip loose or for me to lose my balance trying to stand on the stick. Bad for both me and the roo. However, I found that using a piece of rebar works wonderfully. No slipping and no balance issues for me. It is very quick and easy, even for me and I have strength and control issues in my hands from nerve damage.If you are talking about culling a full grown rooster here I would not chop the head off as if you are squeamish as there will be a fair bit of blood, the best least messy way to do it is to use a broom stick by placing the roosters neck under the stick and stepping on each end and pulling the bird up sharply, it's neck will be broken but there will be no blood, it will flap a bit before it dies so hold onto it firmly, they will do this with any method used as the nerves will be shutting down, the bird is not consciously doing this so do not worry. I would consider somebody else doing this for you though that has no attachment to the bird and who can carry the deed out effectively and quickly, he will still be edible as opposed to any chemical methods that are only really suited to very small chicks.