NATS 1870 Lecture Notes - Lecture 10: Lightfastness, Pigment

• School: York University
• Department: Natural Science
• Course: NATS 1870
• Professor: Banafsheh Hashemi Pour

Document Summary

Acids and basis can be defined in different ways one of the most popular ways is bronsted- Acids: any chemical that donates a hydrogen ionh^+ or simply a proton. Bases: any chemical that accepts a hydrogen ion h^+ or simply a proton. Pigment: a material that absorbs some of the visible light, reflecting other wavelengths back into our eyes, creating an overall appearance of color. Pigments are used as coloring agents in a variety of applications: paints, ink, fabric, plastic, cosmetics, and food. Pigments are also naturally found in many plants and animals, producing (cid:373)a(cid:374)y of (cid:374)ature(cid:859)s (cid:272)olors. The (cid:373)ost (cid:858)i(cid:373)porta(cid:374)t(cid:859) attribute of a pigment is its apparent color, which is mainly determined by the molecular structures of the elements making up the pigment itself, and the types of energy states possible for that molecule. Pig(cid:373)e(cid:374)t parti(cid:272)les are usually sig(cid:374)ifi(cid:272)a(cid:374)tly (cid:858)large(cid:859) i(cid:374) size, ra(cid:374)gi(cid:374)g fro(cid:373) 5(cid:1004) (cid:374)(cid:373) to (cid:1005)(cid:1004)(cid:1004),(cid:1004)(cid:1004)(cid:1004) (cid:374)(cid:373) o(cid:374) average.