Ptah

In Egyptian mythology, Ptah (; , probably vocalized as Pitaḥ in ancient Egyptian) is the demiurge of Memphis, god of craftsmen and architects. In the triad of Memphis, he is the spouse of Sekhmet and the father of Nefertum. He was also regarded as the father of the sage Imhotep.

Phosphotungstic acid haematoxylin (PTAH) is a mix of haematoxylin with phosphotungstic acid, used in histology for staining.