How to Obtain Footprint Moulds, Kid's Stuff - Birding In Spain
First find a suitable footprint, (fig: 1) blow it a little to remove dust and grit but without touching it; do not remove incrusted twigs or other material so as not to ruin the print.
Encircle the print with a strip of card, holding it together with paper clips and pressing it into the mud (fig: 2). To make the plaster mix the powder with water in a recipient where it can be stirred, or else which can be closed and shaken.
When the mixture reaches the right consistency empty it into the card ring on top of the track (fig: 3).
After some 15-30 minutes, when it has dried, cut the mud underneath the track and remove the piece whole (figs: 4 & 5). It can be cleaned later at home. Wrap it in newspaper to transport it .
24 hours later the mould will be dry. Remove the clips and cardboard and wash and brush the mould under the tap with an old toothbrush.
Lastly the mould can be labelled with the most interesting information: species, date, location, etc.
This mould is the negative and can be used to obtain any number of positives. To do this spread the mould with vaseline and place it on plaster, mud, etc. In the case of plaster a dye or iron oxide can be added to give it some colour.