Hi Ariel i use plain old european pine resin, it is easy to source.As for the colour i use very fine brick dust witch makes a dark brown product or you could add powdered charcoal to darken or ochre or other coloured dryed and powdered clays/soils to get the colour you desire.I get very fine brick dust from a model railway supplier this works very well.
You can also ajust the recipy to make a softer or harder cooled product.
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