How the brilliant automatic iodine cotton stick works.

These little things are very clever. They look like a standard cotton bud, but have liquid in the stem that is released into one end automatically when the other end is snapped. You can get them with a povidone iodine fill for sterilising small wounds or an alcohol fill for either wounds, or in our case precise cleaning applications.
Sounds easy enough, but the secret is in a unique gel that must have taken a lot of research to perfect.
Here's an ebay com search link for the iodine ones (typical price $4 per 100):-
And a search link for the cleaning alcohol ones (typical price $4 per 100):-
As requested I've done the iodine-starch test and used a swab to soak some grains of rice. They turned a dark black/blue suggesting that the contents are iodine based.
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