If I am selling a stack of items, say 12 crystals, when it asks for a price is that per unit or for the whole stack? For example if I enter 1,000, when the stack of 12 sells will I make 12k or only 1l?

In the AH why do some item names show up as red text and also normal text?

When searching the AH, how can you tell the difference from stacks and single items?

Thanks!