interact with the chloroform bottle.
use item " bottle of chloroform " to eqip.
interact with ink bottle with the bottle of chloroform equipped .
interact with the sign switch.
interact with the panic button .
this bit is important you have to let Matches press the panic button if you press it you will not get the trophy .
interact with bottle.
interact with panic button
use item " bottle " to eqip .
interact with Matches with bottle equipped
thanks to AlexanderPihl for the youtube clip this is from the 30th Anniversary version of the game but its the same.