Well-prepared
131Iron gall ink — Oak galls and iron(II) sulfate, ingredients of iron gall ink Iron gall ink (also known as iron gall nut ink or oak gall ink) is a purple black or brown black ink made from iron salts and tannic acids from vegetable sources. It was the st …
132University of Puerto Rico, Rio Piedras Campus — Infobox University name = University of Puerto Rico, Rio Piedras Campus native name = Universidad de Puerto Rico, Recinto de Río Piedras image size = 200px caption = Famous clock tower latin name = motto = tagline = established = 12 March 1903… …
