Dear hive mind, I seem to be having a creativity drought today. Can any of you lovely people suggest an alternative to the RSC plasticine+sand method for modelling how an alloy has different properties to its component elements? We don't want to make solder for real and don't have the plasticine to spare for ditching after use (covid rules). I tried cornflour-paste +/- sand, to see if it affected properties (e.g. speed with which a 10g mass sank into it), but this did not give me enough of a difference to be convincing.