Chemically

This letter, inscribed in a feminine, but irregular hand, and in some places almost illegible, plainly attesting the state of the mind which had dictated it;—stained, too, here and there, with spots of tears, which chemically acted upon by the ink, assumed a strange and reddish hue […]

“This material has a specific hardness and is chemically very stable. It forms naturally from calcium alone, but bacteria accelerate the transformation into calcium carbonate,” explains Alejandro Montesinos, head of the Decarbonization, Climate Change, and Circular Economy Research Group at Tec de Monterrey and a member of the Institute of Advanced Materials and Sustainable Manufacturing.

It starts out as kind of a chemically taste, sharp and irritating, but then there's another taste underneath, like some kind of plant, maybe . . . flowers?