Pentraerythritol tetranitrate is used in Primacord, or blended with RDX and called Semtex. It needs a detonator.
Semtex has a detection taggant added to produce a distinctive vapor signature to aid detection. First, ethylene glycol dinitrate was used, later switched to 2,3-dinitro-2,3-dimethylbutane (3,4-dinitrohexane, DMDNB), which is used currently. According to the manufacturer, the taggant agent was voluntarily being added by 1991, years before the protocol signed became compulsory
There are Muslim chemists who actually know what they're doing. If they make a batch of Semtex for jihad purposes, they will not add taggants.