Substantial conductivity is commonly observed in nominally undoped diamond grown by chemical vapor deposition. Photolithography is typically used with metal or other thin film deposition, wet and dry etching. A PERC is created through an additional film deposition and etching process. Follow by finalizing the transistors using etch and deposition processes. Cubic SiC is usually grown by the more expensive process of chemical vapor deposition (CVD). Secondary sedimentary structures are those which formed after deposition. Another popular method of growing synthetic diamond is chemical vapor deposition (CVD). Chrome plating is a finishing treatment using the electrolytic deposition of chromium. This may be the result of a halt in the deposition of sediment. It is exploited in the manufacturing of optical fiber in vacuum deposition processes. Sedimentary structures include all kinds of features formed at the time of deposition. Specific biochemical reactions exist for mineral deposition. Erythropoietic porphyria is a genetic disease resulting in the deposition of porphyrins throughout the body. This may be due to SLS interacting with the deposition of fluoride on tooth enamel. Sexual reproduction occurs through the clustered or scattered deposition of spermatophores by male adults.