Why do woven fabrics stretch more on the bias?
Yes I agree with what's been said
Air dry clay produces an object that is moderately robust and does not dirt off so it can be painted with suitable claysIt is not ceramics which have received to be fired to over 1500F, nevertheless it's pottery - however you can not ever let it get wet - simply right on shelf, but no longer for keeping wetness.
Depending on the refrigerator, The pieces will dry but they may also crack An easy way to slow drying at room temperature is to take some plastic wrap and loosely wrap around the piece There are enough gaps for water to slowly evaporate Slower drying is less stressful Say left uncovered the piece will dry in a day wrapped may take 4 or 5 days I would take the broken pieces and try to moisten in a plastic bag and when it is soft enough I would start to dry to a workable condition Warning mold or other things may grow I had the lessons from an old ceramic sculptor and learned reclaiming clay EDIT The other answer has a good point about an even thickness of clay drying better
How thick did you make the horns? If solid and a couple of inches or more across at the base, then it will take a very long time to dry them without crackingYou will probably have to make them hollow (like real horns are for different reasons) so that the clay is of roughly uniform thickness - 3/8-1/2 (9-12mm) everywhere so it will dry uniformly and not shrink around a still damp interior.
Because there is no constraining yarns in the direction of the bias, allowing the fabric to distortWeave some paper strips and then pull on the biasyou'll see what happens.