For the slime mold genus, see Didymium (slime mold).
Didymium glasses
Didymium (Greek: δίδυμο, twin) is a mixture of the elements praseodymium and neodymium. It is used in safety glasses for glassblowing and blacksmithing, especially with a gas (propane)-powered forge, where it provides a filter that selectively blocks the yellowish light at 589 nm emitted by the hot sodium in the glass without having a detrimental effect on general vision, unlike dark welder's glasses. The usefulness of didymium glass for eye protection of this sort was discovered by Sir William Crookes.
Didymium photographic filters are often used to enhance autumn scenery by making leaves appear more vibrant. It does this by removing part of the orange region of the color spectrum, acting as an optical band-stop filter. Unfiltered, this group of colors tends to make certain elements of a picture appear "muddy". These photographic filters are also used by nightscape photographers, as they absorb part of the light pollution caused by sodium street lights. Didymium was also used in the sodium vapor process for matte work due to its ability to absorb the yellow color produced by its eponymous sodium lighting.
Didymium is also used in calibration materials for spectroscopy.[1]
^Venable, W.H.; Eckerle, K.L. (October 1979). Didymium glass filters for calibrating the wavelength scale of spectrophotometers: SRMs 2009, 2010, 2013, and 2014. National Institute of Standards and Technology. NIST (Report). U.S. Department of Commerce. NIST doc 10486.
Didymium (Greek: δίδυμο, twin) is a mixture of the elements praseodymium and neodymium. It is used in safety glasses for glassblowing and blacksmithing...
chemist Carl Gustav Mosander extracted a rare-earth oxide residue he called didymium from a residue he called "lanthana", in turn separated from cerium salts...
lanthanum oxide and a pinkish third component which he called "didymium" meaning "twin". Didymium was accepted as an element for many years, appearing in Dmitri...
acid. The metals that formed these oxides were thus named lanthanum and didymium, officially discovered in Vienna in 1885 by Carl Gustaf Mosander. Von Welsbach...
Didymium difforme is a species of slime mold belonging to the family Didymiidae. "IRMNG - Didymium difforme (Pers.) Gray, 1821". www.irmng.org. Retrieved...
Didymium wildpretii is a species of slime mold which feeds on the decaying remains of various species of cacti. It was first described in 2007 and has...
a so-called "element" that was even given the chemical name of "didymium". "Didymium" was found some years later to be simply a mixture of two genuine...
astronomical filters similarly use didymium in heavier concentration. Even astronomical filters which don't use didymium typically are some kind of narrow...
difficult one, and those were formerly thought to be just one element didymium – but that is an alloy of the two.[citation needed] There are two series...
and on bryophytes. Most Myxogastria are terrestrial, though some, like Didymium aquatilis are aquatic, and D. nigripes is semi-aquatic. Myxogastria are...
Douglas. "cereal". Online Etymology Dictionary. Retrieved 2011-01-02. didymium was originally mistaken for an element, later it was discovered that it...
sodium, and expand the ability to see violet and blue hues, similar to didymium glass. Specialty tasting glasses made of cobalt glass are used by professional...
example, Squamuloderma nullifila is actually a species from the genus Didymium. The following classification is based on Adl et al. (2005) while the classes...
professor of general and agricultural chemistry. In 1874 he theorised that didymium was in fact two elements; this theory was confirmed in 1885 when Carl Auer...
Welsbach in 1901, was an Austrian scientist and inventor, who separated didymium into the elements neodymium and praseodymium in 1885. He was also one of...
name for promethium. D Didymium 59/60 Mixture of the elements praseodymium and neodymium. Mosander wrongly believed didymium to be an element. Da Davyum...
such as neodymium and praseodymium being thought to be the single element didymium. Very small differences in solubility are used in solvent and ion-exchange...
curriculum design Di, a prefix used in organic chemistry nomenclature Didymium, a mixture of the elements praseodymium and neodymium once thought to be...
G. Mosander 1885 C. A. von Welsbach Discovered by Mosander and called didymium. Carl Auer von Welsbach later split it into two elements, praseodymium...
to −4 °C, with an average minimum temperature of 10 °C. The slime mold, Didymium wildpretii feeds on the decaying remains of F. latispinus in Mexico. Biología...
lanthanum, a tetravalent cerium, and a pentavalent didymium. However, the higher valency for didymium had not been established, and Mendeleev tried to do...
a second element from cerium, and this he called didymium. Although he did not realise it, didymium too was a mixture, and in 1885 it was separated into...
pp. 1248–9 Mosander, C. G. (1843). "On the new metals, Lanthanium and Didymium, which are associated with Cerium; and on Erbium and Terbium, new metals...
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