→ Color Coding
1) Old movies [O=Oxygen] are Black and White
2) We laugh a lot, we become Blue [N2O = laughing gas]
3) We inhale more CO2, we become grey [CO2 = grey]
4) Air = O2 + CO2 → Grey Body + B/W shoulders
5) Cyclop'RO'P are → OR ange
6) ENTONOX → CO2 + O2 + N2O →Grey + Blue + B/W Shoulders