Try this:
def FindLabel ([cis12DCE],[cis12DCE_Ex]):
if int([cis12DCE_Ex]) == 1:
return ""+"cis-1,2-Dichloroethylene "+str([cis12DCE])+""
else:
return "cis-1,2-Dichloroethylene "+str([cis12DCE])
def FindLabel ([cis12DCE],[cis12DCE_Ex]):
if int([cis12DCE_Ex]) == 1:
return "<clr red = '255'>"+"cis-1,2-Dichloroethylene "+str([cis12DCE])+"</clr>"
else:
return "cis-1,2-Dichloroethylene "+str([cis12DCE])