We went through much the same thing with "marbles" a few years ago. The "Duck" test is a good way to determine if it should/would be allowed. Show some of the material to someone and ask them what it is. If they say "sand" it's allowed. Any other response leaves doubt.NikitaB wrote:Do you think that fine materials other than sand are allowed?
The Duck Test: If it walks like a duck, swims like a duck and quacks like a duck, it's a duck! (Names have been changed to prevent censoring)