The previous page is sending you to https://www.alamy.com/cytological-technique-the-principles-underlying-routine-methods-histology-technique-cytology-technique-skeleton-formula-for-haematein-dyes-o-haematein-catechol-formula-shows-this-is-not-only-an-acid-dye-but-actually-an-acid-related-to-catechol-it-is-of-a-brownish-red-colour-but-becomes-blue-in-alkaline-solution-it-is-therefore-used-as-an-indicator-of-ph-but-it-is-not-valuable-by-itself-as-a-dye-when-used-with-an-intermediary-or-mordant-p-110-between-itself-and-the-tissues-it-becomes-one-of-the-most-important-dyes-used-in-micro-technique-haematein-is-derived-from-the-image216169567.html.

 If you do not want to visit that page, you can return to the previous page.