Fun facts: (1) "Combeferre" apparently gets transliterated into Japanese as "konbu ferre", which in turn Google translates to English as "kelp fail" (h/t sclez) and (2) kelp was an important historical source of sodium carbonate. This explains everything, except why I somehow took this as a fic promt, for which you probably have to blame my extreme sleep deprivation at the time.
( kelp fail )
Also here on AO3. Sorry for the Les Mis spam, everyone.
( kelp fail )
Also here on AO3. Sorry for the Les Mis spam, everyone.