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Fullformexpand.com, 2026. "PTAH." Accessed February 21, 2026. https://www.fullformexpand.com/ptah/phosphotungstic-acid-hematoxylin.
"PTAH." (n.d.). Fullformexpand.com. Retrieved February 21, 2026, from https://www.fullformexpand.com/ptah/phosphotungstic-acid-hematoxylin.
PTAH. (2026). Fullformexpand.com. Available at: https://www.fullformexpand.com/ptah/phosphotungstic-acid-hematoxylin (Accessed: 21 February 2026).