Taybha
Whalewhine
I like to pick mine up and flip them over to check for mass and density I'm told these are 2 different words to use when testing them,I also blow on them very hard to see how long the condensation remains,if it's over 10 seconds just use 1 finger and rub it off, sometimes you need more than one finger but this is generally frowned upon by jug testing connoisseurs, anything else you need to know will be in a very informative magazine called 50+ Jugs.