Period 6 element devices though concerns about the element's toxicity have led to mercury thermometers and sphygmomanometers being largely phased out in clinical environments in favor of alcohol-filled, galinstan-filled, digital, or thermistor-based instruments. It remains in use in scientific research applications and in amalgam material for dental restoration. It is used in lighting: electricity passed through mercury vapor in a phosphor tube produces short-wave ultraviolet light which then causes the phosphor to fluoresce, making visible light. Thallium is a chemical element with the symbol Tl and atomic number 81. This soft gray other metal resembles tin but discolors when exposed to air. The
SN 2002cx is extinct in B-V color by 0.034 magnitudes from dust in Milky Way. SN 2002cx is similar to SN 1999ac in B-V at max, but also at times as late as 50 days after max which is unexpected as the two supernovae evolve differently at late times. SN 2002cx has a B-V color of -0.04±0.04 at 4 days before max, and 0.04±0.05 at the time of max in the B-band which is bluer than SN 1991bg at the same time. The color of SN 2002cx is consistent with Lira-Phillips law at late times. The V-R color of SN 2002cx evolves