Perylene or perilene is a polycyclic aromatic hydrocarbon with chemical formula C₂₀H₁₂ and CAS number 198-55-0, occurring as a brown solid. It or its derivatives may be carcinogenic, and it is considered to be a hazardous pollutant. In cell membrane cytochemistry, perylene is used as a fluorescent lipid probe. Polycyclic aromatic hydrocarbons, also known as PAH, are chemical compounds that consist of fused aromatic rings and that do not contain heteroatoms and that do not carry substituents. ... hjkhj:See also [[ch Link titleemical symbol]]. A chemical formula allasdfsdf crapInsert non-formatted text herecompkjjkjItalic textItalic text--69. ... General Name, Symbol, Number carbon, C, 6 Chemical series nonmetals Group, Period, Block 14, 2, p Appearance black (graphite) colorless (diamond) Atomic mass 12. ... General Name, Symbol, Number hydrogen, H, 1 Chemical series nonmetals Group, Period, Block 1, 1, s Appearance colorless Atomic mass 1. ... CAS registry numbers are unique numerical identifiers for chemical compounds, polymers, biological sequences and alloys. ... Brown is a color produced by mixing small intensities of red and green, orange and blue, or yellow and purple pigment. ... A solid is a phase of matter, characterized by resistance to deformation and changes of volume. ... In pathology, a carcinogen is any substance or agent that promotes cancer. ... Pollutants are substances which directly or indirectly damage us and my kids daddy or the environment. ... Drawing of a cell membrane A component of every biological cell, the selectively permeable cell membrane (or plasma membrane or plasmalemma) is a thin and structured bilayer of phospholipid and protein molecules that envelopes the cell. ... Fluorescence induced by exposure to ultraviolet light in vials containing various sized cadmium selenide (CdSe) quantum dots. ...