Sentence:  Frequently, if a contact preparation between an unknown and an easily supercooled material such as thymol is allowed to digest on the <WSD>hotbar</WSD>, the unknown will develop well defined crystal faces in the mixing zone. 
Meaning of the word marked with <WSD> tags:  A strip on a TAB (tape automated bonding) chip where components are attached by using a reflow head to hold them down while applying pressure and pulse heat to form a bond.