anchor.diff:  8 = tank_pressure < ONE_ATMOS
   16 = tank_pressure < 15*ONE_ATMOS
   32 = tank_pressure go boom.
  -64 = decals/colors got changed
  +64 = colors
  +128 = decals
   */
   
   	if (src.destroyed)
  
positive.code: 	else
  		update_flag |= 32
  
  	if(oldcolor != _color || olddecals != decals)
  		update_flag |= 64
  		olddecals = decals
  		oldcolor = _color
  
  	if(update_flag == old_flag)
  		return 1
  
negative.code: /obj/machinery/portable_atmospherics/canister/sleeping_agent
  	name = "Canister: \[N2O\]"
  	icon_state = "redws"
  	_color = list("redsw", null, null, null)
  	can_label = 0
  /obj/machinery/portable_atmospherics/canister/nitrogen
  	name = "Canister: \[N2\]"
  