To make antibiotics, Senku and his kingdom need to obtain sulfuric acid from a fountain of the stuff. The team goes prepared, but there’s no guarantee that they’ll make it back alive.
Silver reacts with hydrogen sulfide 
and turns black instantly...
الفضّة تتفاعل مع كبريتيد الهدروجين
...وتتحول إلى اللون الأسود في الحال
L’argent noircit
au contact du soufre…
L'argento reagisce all'acido solfidrico
 e si tinge subito di ne—
A prata reage com o sulfeto de
hidrogênio e fica preta na hora.