Do the IS militants have access to chemical weapons?

The IS militants have proved by beheading of innocent US and British persons that they are a bloodthirsty lot and, it now seems that they have access to chemical weapons foxnews.com.

This is an inference that has been drawn from videos that depict dead people with wounds that would end indicate burning of facial muscles through contact with chemicals.
It is not yet established whether these have any link to the chemical weapons of ex-President Saddam Hussein of Iraq or of President Bashar al-Assad of Syria or whether the IS militants have made the weapons themselves by procuring the necessary chemicals.
The video show images of the dead Syrian Kurds with large areas of white, blistered skin apparently having been burned away. And, experts are of the opinion that the chemical weapons were used on July 12, in the village of Avidko, close to Kobani.

This is the Kurdish town on the Turkish border that is now the scene of fierce fighting between Kurds and Islamic State forces.