They used a liquid syrup of ipecac -- to do this.

VOA: special.2009.08.11

Normally this is used for a reaction in the condensed phases and liquid usually.

通常它是用于凝聚态，液体相的反应,这是一个恒压量热计。

麻省理工公开课 - 热力学与动力学课程节选

Sometimes,dry ice particles or liquid propane are used.

VOA: special.2010.01.05

It's also not using any sort of radiation, (which could destroy DNA remnants of the mummies.) "And finally, by using this Terahertz imaging, you eventually may be able to look at the substances within the mummy,for example, the embalming liquid used in the Egyptian way of embalming.

VOA: standard.2010.05.05