Answer:
1. my mnemonic rule is as follows:
Blood cultures: be
Light blue: loving
Red: respectful
Green: gracious
Lavender: lighthearted and
Gray: gentle
2. I had heard the phrase before from nurses, I think mnemonics is the best way to learn and apart from being simple it allows us to become more familiar.
3.in phlebotomy the term refers to the order in which the tubes can be used for taking samples that are organized according to extraction