First mix the alginate with an equal volume of water. It sets very quickly so you have to mix it quickly too!
Pour the mix into a suitable container (here a sawn off water bottle) and plunge in the limb that you wish to caste. Pretty soon you are stuck fast.
Now for the life of me can I get this off?
Eventually yes! Fill with plaster and wait a while. It's best to use hard plaster such as "crystocal" but as MWC had run out I had to use a softer fine plaster which makes the mould more brittle. Finally away the alginate and here is the finished cast of my hand in a meditation mudra.
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