When the gemstones are in a rough state, the gemologist studies the external structure ; the host rock and mineral association ; and natural and polished colour.

When the trade occurred he became a more polished scorer and was projected to have been a third option for the Heat to complement Dwyane Wade and Shaquille O ' Neal, had the circumstances of the season turned out differently.

" When polished by a lapidary the thomsonites sometimes display chatoyancy.

When polished or etched with acid to reveal these features, a distinct boundary is observed between the martensite portion of the blade and the pearlite.

When this happens, the instrument may need refretting ( the frets are removed and replaced ) or, in less severe cases, " fret dressing " ( the frets are leveled, polished, and possibly recrowned ).

When the details are completed, the shell is then soaked in olive oil, cleaned with soap and water and selectively polished with a hand brush.

After a quick change, Anderson reappeared as the polished gentleman and sang " When the Cuckoo Sings ", instantly winning the hearts of the audience with his perfect yodehng, causing said audience to cheer like mad for more.

When dry, the stone resembles ordinary limestone but when wet or polished using lapidary techniques, the distinctive mottled pattern of the six-sided coral fossils emerges.

When light passes through a gemstone and strikes a polished facet, the minimum angle possible for the facet to reflect the light back into the gemstone is called the critical angle.

When he was two, his family moved to Ciudad Juárez, a northern border town where he and his brothers, Tin-Tan, and El Loco Valdés, polished their acting skills.

When first carved, the surface of the moai was polished smooth by rubbing with pumice.

When the tram-lines were removed in the nearby suburb of Ambler Thorn, he realised that he had been using the polished strips of steel to navigate.

When cut across the fibers and polished on the ends, satin spar exhibits an optical illusion when placed on a printed or pictured surface ; and is often called and sold as the “ television stone ” ( as is ulexite ).

When applied to unfired clay surfaces, " terra sig " can be polished with a soft cloth or brush to achieve a shine ranging from a smooth silky lustre to a high gloss.

According to theater historian John Kenrick, " When the curtain slowly rose to reveal forty pairs of tap-dancing feet, the star-studded opening night audience at the Winter Garden cheered ... Champion ( who had no tap training ) followed this number with a series of tap-infused extravaganzas larger and more polished than anything Broadway really had in the 1930s.

When a big story broke at the last minute, a polished ready-to-air show was reorganized: the entire menu was shifted as events demanded.

When Dear You was released in September 1995, however, its polished production and clear vocals strongly divided the band's fanbase.

When cut and polished, the meteorite showed beautiful yellowish olivine ( peridot ) crystals.

When prepared for use as a pipe, the natural nodules are first scraped to remove the red earthy matrix, then dried, again scraped and polished with wax.

When cut and polished the result is a beautiful ornate stone, much desired for church decoration, particularly during the Middle Ages

When she tried to show them that she was still the same polished girl they knew from London by throwing a picnic, she asked that Tarzan wear his father's suit.

When farmers sharpened their blades for combat, the blade was polished clean and white.

When the British Commonwealth Occupation Forces arrived in Japan — all with boots polished to a degree not known in the U. S. forces — the G. I. s were more conscious than ever of their feet.

When an inlay is used, the tooth-to-restoration margin may be finished and polished to such a super-fine line of contact that recurrent decay will be all but impossible.

When gastric hydrochloric acid reaches the nerves in the gastrointestinal mucosa, they signal pain to the central nervous system.

When the partial pressure of is reduced, for example when a can of soda is opened, the equilibrium for each of the forms of carbonate ( carbonate, bicarbonate, carbon dioxide, and carbonic acid ) shifts until the concentration of in the solution is equal to the solubility of CO < sub > 2 </ sub > at that temperature and pressure.

When LABs compete for nutrients, their metabolites often include active antimicrobials such as lactic and acetic acid, hydrogen peroxide, and peptide bacteriocins.

When jewelry containing diamonds is heated ( for repairs ) the diamond should be protected with boracic acid ; otherwise the diamond ( which is pure carbon ) could be burned on the surface or even burned completely up.

When jewelry containing sapphires or rubies is heated, it should not be coated with boracic acid or any other substance, as this can etch the surface ; they do not have to be " protected " like a diamond.

When ionized hydrogen is written as " H < sup >+</ sup >" as in the solvation of classical acids such as hydrochloric acid, the hydronium ion, H < sub > 3 </ sub > O < sup >+</ sup >, is meant, not a literal ionized single hydrogen atom.

When later adapted by Carl Auer von Welsbach for the splitting of didymium, nitric acid was used as a solvent to lower the solubility of the system.

When dissolved in hydrochloric acid, a water-soluble yellow salt, PmCl < sub > 3 </ sub >, is produced ; similarly, when dissolved in nitric acid, a nitrate results, Pm ( NO < sub > 3 </ sub >)< sub > 3 </ sub >.

When the tRNA has an amino acid linked to it, it is termed " charged ".

When treated with potassium fluoride and hydrofluoric acid, Th < sup > 4 +</ sup > forms the complex anion, which precipitates as an insoluble salt,.

When baking soda and vinegar are combined, the bicarbonate ion of the baking soda is turned into carbonic acid, which decomposes into carbon dioxide and water.

When it has caught and eaten that prey, it closes its right aortic arch and uses its left aortic arch to flush blood loaded with carbon dioxide from its muscles directly to its stomach ; the resulting excess acidity in its blood supply makes it much easier for the stomach lining to secrete more stomach acid to quickly dissolve bulks of swallowed prey flesh and bone.

When standardized, it is done so as a percentage of valerenic acid or valeric acid.

When the biological significance of nicotinic acid was realized, it was thought appropriate to choose a name to dissociate it from nicotine, to avoid the perception that vitamins or niacin-rich food contains nicotine, or that cigarettes contain vitamins.

When a lead – acid battery is charged or discharged, this initially affects only the reacting chemicals, which are at the interface between the electrodes and the electrolyte.

When that mixture has dried, the metal stylus is used on the plate and thereby removes some of the grit particles, so that minuscule areas of copper are exposed to the acid and etched ; they will eventually hold the ink for the printing process.

When jewelry containing rubies is heated ( for repairs ) it should not be coated with boracic acid or any other substance, as this can etch the surface ; it does not have to be " protected " like a diamond.

When he was eight years old his father gave him a large chemistry set which was enhanced over the next few years with extra chemicals including a bottle of concentrated sulphuric acid, bought from a pharmacy, at a time when pharmacists were less regulated than now.

When these cytokine factors bind, the arachidonic acid pathway is then activated.

When some strong acid is added to an equilibrium mixture of the weak acid and its conjugate base, the equilibrium is shifted to the left, in accordance with Le Chatelier's principle.

When carbon dioxide dissolves in water it exists in chemical equilibrium producing carbonic acid:

A 2007 USDA comparison between steaming and boiling vegetables shows the most affected nutrients are folic acid and vitamin C. When compared to raw consumption, steaming reduces folic acid by 15 %, and boiling reduces it by 35 %.