Revisiting the classics: on the optical colours of novae as standard crayons. - Craig, Peter; Aydi, Elias; Chomiuk, Laura; Strader, Jay; Stone, Ashley; Sokolovsky, Kirill V; Mukai, Koji; Kawash, Adam; Fló, Joan Guarro; Boussin, Christophe; Charbonnel, Stéphane; Garde, Olivier (Monthly Notices of the Royal Astronomical Society, 2025)