adjective
definition
Having little or no colour.
definition
(of a liquid) Water white.
definition
Lacking in interest or variety.
Examples of colourless in a Sentence
It is tasteless, colourless and odourless gas, which is exceedingly stable and inert.
The blood is colourless.
The salts of the acid are colourless or faintly yellow.
Examples of the first case are found among the colourless acridines and quinoxalines which give coloured salts; of the second case we may notice the colourless hydrochloride and sulphate of the deep yellow o-aminobenzophenone.
They are either colourless liquids, which boil without decomposition, or crystalline solids; and are both basic and acidic in character.
Thus para-nitrophenol has colourless molecules, but an intensely yellow negative ion.
In neutral, and still more in acid solutions, the dissociation of the indicator is practically nothing, and the liquid is colourless.
The different kinds of mica vary from perfectly colourless and transparent - as in muscovite - through shades of yellow, green, red and brown to black and opaque - as in lepidomelane; the former have a pearly lustre and the latter a submetallic lustre on the cleavage surfaces.
Phlogopite is rarely found as colourless transparent sheets and is therefore almost exclusively used for electrical purposes.
By dissolving red lead, Pb304, in glacial acetic acid and crystallizing the filtrate, colourless monoclinic prisms of lead tetracetate, Pb(C2H302)4, are obtained.
It forms colourless transparent crystals, soluble in one and a half parts of cold water and in eight parts of alcohol, which on exposure to ordinary air become opaque through absorption of carbonic acid, which forms a crust of basic carbonate.
Solutions of lead salts (colourless in the absence of coloured acids) are characterized by their behaviour to hydrochloric acid, sulphuric acid and potassium chromate.
These are colourless crystalline compounds, which are most readily prepared by passing ammonia gas into an ethereal solution of the aldehyde.
It is a colourless liquid, with a very pungent smell, and attacks the mucous membrane very rapidly.
The nitro compounds are colourless, somewhat pleasant smelling liquids, which distil without decomposition and possess boiling points much higher than those of the isomeric nitrous esters.
They are colourless solids which are readily soluble in water and possess the character of weak acids.
They discriminate between the red or erythro-salts, which are well crystallized, very explosive and unstable compounds, and which regenerate the colourless nitrolic acid on the addition of dilute mineral acids, and the leuco-salts, which are colourless salts obtained by warming the erythro-salts or by exposing them to direct sunlight.
An intensely yellow acid salt is described, as is also a very unstable colourless salt which could not be examined further owing to its very labile nature.
On Dec. 27 1912 Cuvaj was replaced by a colourless official, Dr. Unkelhausser, who marked time until a fresh candidate for the post of commissary or dictator was forthcoming in the person of Baron Skerlecz (July 23 1913).
He also made If we remember that by " blood " Aristotle understood " red blood," and that he did not know of the existence of colourless blood, his primary division is not a bad one.
Stannous salt solutions yield a brown precipitate of SnS with sulphuretted hydrogen, which is insoluble in cold dilute acids and in real sulphide of ammonium, (NH 4) 2 S; but the yellow, or the colourless reagent on addition of sulphur, dissolves the precipitate as SnS 2 salt.
A "transudate" is a liquid having a composition resembling that of blood-serum, while the term "exudate" is applied to an effused liquid whose composition approaches that of the blood-plasma in the relationship of its solid and liquid parts, besides in most cases containing numbers of colourless blood-corpuscles.
If oxide of copper is added to a glass mixture containing a strong reducing agent, a glass is produced which when first taken from the crucible is colourless but on being reheated develops a deep crimson - ruby colour.
These glasses may be colourless or coloured.
The latter are made by dipping a small mass of molten colourless glass into an iron cup around the inner wall of which short lengths of white cane have been arranged at regular intervals.
They, moreover, suggested the introduction for the manufacture of table-glass of a material similar in texture to that used by the Venetians, both colourless and tinted.
For the highest quality of bottles, which are practically colourless, sand, limestone and sulphate and carbonate of soda are used.
The invention of colourless Bohemian glass brought in its train the practice of cutting glass, a method of ornamentation for which Venetian glass, from its thinness, was ill adapted.
A more important outcome, however, of Italian influence was the production, in emulation of Venetian glass, of a glass made of refined potash, lime and sand, which was more colourless than the material it was intended to imitate.
This colourless potash-lime glass has always been known as Bohemian glass.
About 1350 considerable quantities of colourless flat glass were supplied by John Alemayn of Chiddingfold for glazing the windows in St George's chapel, Windsor, and in the chapel of St Stephen, Westminster.
It is the most brilliant and the most colourless of all glasses, and was undoubtedly first perfected in England.
When pure, it is a colourless gas which is not spontaneously inflammable at ordinary temperature and pressure, but a slight increase of temperature or decrease of pressure sets up decomposition.
It is a colourless, strongly fuming gas which has a suffocating smell.
These normal esters are colourless, pleasantsmelling liquids, which are readily soluble in water.
Silver vapour is blue, potassium vapour is green, many others (mercury vapour, for instance) are colourless.
Benzene is a colourless, limpid, highly refracting liquid, having a pleasing and characteristic odour.
These are minute, oval, colourless spores, which serve to spread the disease over the vineyard and from place to place.
All sugars are colourless solids or syrups, which char on strong heating; they are soluble in water, forming sweet solutions but difficultly soluble in alcohol.
The salt crystallizes out on cooling with 7 molecules of water, forming colourless orthorhombic prisms, usually small and needle-shaped.
Titanium ch oride, TiC1 4, is obtained as a colourless filming liquid of 1.7604 sp. gr.
Titanium oxide when fused with microcosmic salt in the oxidizing flame yields a bead which is yellowish in the heat but colourless after cooling.
The primary amines are colourless liquids or crystalline solids, which are insoluble in water, but readily soluble in the common organic solvents.
It crystallizes in small colourless needles and is easily soluble in water; the concentrated aqueous solution dissolves bromine and iodine readily.
It is a colourless, amorphous solid, which is almost insoluble in water, its solubility diminishing with increasing temperature; it is appreciably soluble in concentrated sulphuric acid.
Pure ethyl alcohol is a colourless, mobile liquid of an agreeable odour.
The solution is filtered and allowed to cool, when colourless rhombic pyramids of the aurocyanide separate.
Potassium auricyanide, 2KAu(CN) 4.3H 2 O, is obtained as large, colourless, efflorescent tablets by crystallizing concentrated solutions of auric chloride and potassium cyanide.
It forms colourless, monoclinic prisms, which turn brown on exposure to air.
Sodium aurothiosulphate, 3Na 2 S 2 O 3 Au2S203.4H20, forms colourless needles; it is obtained in the direct action of sodium thiosulphateongoldinthe presence of an oxidizing agent, or by the addition of a dilute solution of auric chloride to a sodium thiosulphate solution.