The eggs are of a beautiful greenish-blue colour, with a few large and small brown blotches and streaks, mostly at the large end.
A second sheet treated with tincture of guaiacum and ozonised ether will give a blue colourmore or less intense, according to the quantity of the blood.
A lively sky-blue colour, but without much depth or body.
In the first place, the sapphire of the Greeks and Romans was of a sky-blue colour with a violet or purplish glance; and sometimes it had a very dark or almost blackish-blue colour.
Sometimes he adds to the essence some red, yellow, or blue colour; but as this is a deviation from nature, it is not accounted a beauty.
Or, a little solution of starch and a few drops of sulphuric or nitric acid may be at once added to the oil, when a blue colour will be developed if iodine, or an iodide, has been mixed with the sample.
Its alcoholic solution, dropped on a piece of absorbent white paper, and exposed to the action of nitrous gas, does not acquire a green or blue colour; if it does, guaiacum resin is present.
A slip of deal dipped into it, and afterwards in hydrochloric acid, and then allowed to dry in the air, acquires a greenish-blue colour.
After evaporation the latter is easily recognised through its wormwood-like aroma; it also gives a reddish-yellow solution with concentrated sulphuric acid, which changes quickly to an indigo-blue colour.
Test another for iodates by taking up with a little water, adding a few drops of starch paste and then dilute sulphurous acid solution a little at a time; there should be no blue colour.
A portion of the solution is drawn off with a pipette; if it smells of ammonia, has no blue colour, and gives no precipitate with ammonic sulphide, the separation is complete.
It is mainly used in the manufacture of smalts for imparting a blue colour to glass and enamels.
On shaking the mixture the ether dissolves the higher oxide of chromium which is formed, and acquires a blue colour.
Thus, for instance, a solution of copper sulphate is of a blue colour, while a solution of copper chloride is green.
It would then show a blue colour, either by itself or on addition of an acid, and blue particles under the microscope, if in sufficient quantity.
As for the phosphoric acid reaction producing a blue colour, I have never succeeded in obtaining it.
C) If cautiously heated for ten or fifteen minutes on the water-bath with a few drops of syrupy phosphoric acid, aconitia is said to yield a violet or blue colour.
It differs from all other species in being of a slaty-blue colour, with two black bars on the wings, and with the croup (or loins) white.
It remains unaltered in the air at ordinary temperatures, is opaque, and of a blackish indigo-blue colour.
This residue is treated with sulphuric acid, and distilled at a high temperature, when there is left a compact mass of a deep greenish-blue colour.
Another smaller kind, which I could not capture, was of a pale silvery-blue colour, and the polished surface of its wings flashed like a silver speculum as the insect flapped its wings at a great elevation in the sunlight.
The wings are of a rich dark-blue colour, with a broad border of silvery green.
The beautiful light-blue colour of its plumage was plainly discernible at that distance.
The first impression of fire usually developes a blue colour; a second degree produces a yellow; and, if the oxidizement augments, the iron becomes red.
If the proportion of tin be too small, the composition will be yellowish; if it be too great, the composition will be of a grayish-blue colour.
In this experiment, the black and anhydrous deutoxide of copper gradually acquired a blue colour, as if a hydrate were formed under the influence of the feeble electric current formed by the arrangement.
The upper surface of the mass became of a blue colour, but the lower remained of a dull white.
If chloride of lime, however, be added instead, and a commencement of precipitation of gold be brought about, the gold will be of a blue colour, having a slight tendency to purple.
If no blue colour is apparent, the substitution of the silver for the copper is complete; if not, more silver oxide must be added till the desired end is attained.
Both jaws should be hardened and tempered a blue colour.
This hardening and tempering of springs is done in some cases by polishing and heating over a fire and drawing them to a blue colour.
The chisel is hardened and tempered almost the length of the whole blade, a blue colour, by heating it red hot, plunging it into water, polishing, and drawing the temper on a hot piece of iron.
The flowers are of a pale and delicate grey-blue colour, nearly as large as those of the common Vinca major, but they are borne more generously as to numbers on radical shoots that form thick, healthy-looking tufts of polished green foliage.
The above list will hopefully provide you with a few useful examples demonstrating the appropriate usage of "blue colour" in a variety of sentences. We hope that you will now be able to make sentences using this group of words.
