In winter, when fishing, hands often freeze. I offer a simple to manufacture, and practical hand warmer.
We will need
Shampoo bottle 200 ml
Aluminum wire with a diameter of about 3-4 mm, length 350-400 mm
Blue vitriol
Common salt
And 50 grams of water
We twist the wire in a spiral, select the diameter under the neck of the bottle so that it freely enters.
And stretch it to the height of the bottle
We use an ordinary screwdriver
Now we are preparing our filling.
Vitriol 3 parts (for example 3 tablespoons)
Salt 2 parts (respectively 2 tablespoons)
Mix everything
For the filling of our 200 mm bottle, we need 2 tablespoons of our already mixed filling.
Pour the mixture into a bottle
Then insert the stretched wire
Almost everything is ready
It remains to add 30-50 g of water and shake
In a minute, a reaction begins. Set the bottle aside at this time (for safety). And do not forget to remove the cover, to exit the vapor.
As the reaction calms down, you can close the lid and warm your hands
