If it was town gas used in that time @random Scottish history it was that smell sulfer smell natural gas as you said has smell added to it it sounds like another type of gas cause that Jenny but I could be wrong Ps just looked it up Jenny it's carbon monoxide gas that turned gas light green in colour it may also change the sky light that purple but again it stated not harmful as it's not contained space eg room bottom of ship hold
If it was town gas used in that time @random Scottish history it was that smell sulfer smell natural gas as you said has smell added to it
it sounds like another type of gas cause that Jenny but I could be wrong
Ps just looked it up Jenny it's carbon monoxide gas that turned gas light green in colour it may also change the sky light that purple but again it stated not harmful as it's not contained space eg room bottom of ship hold