If any of you guys need a little help with remembering what colours metal ions burn, the UtaPri guys can actually help! As sure as I am that they’re all garbage at academics (perhaps with Ai and Tokiya being the only exceptions), they provide an easy way to remember!
Sodium: Like the Na in Natsuki, sodium burns yellow! (Bonus: sodium, like Satsuki, is extremely reactive.)
Potassium: K, as in MiKaze Ai, burns lilac!
Calcium: Brick red, like Otoya, because the little boy needs STRONG BONES :D
Lithium: Like Ranmaru, lithium is very reactive, and they’re both crimson!
Copper: If you didn’t already know that it’s blue-green, just think of Camus -- and how he’d never use a metal as cheap as copper, so Reiji has to convince him!
Barium: As Cecil’s Agnapolian relatives tried to do -- bury ‘im [sounds like barium]. They’re both apple green.