tinge

A small added amount of colour; (by extension) a small added amount of some other thing.

Though a ſingle grain of copper diſſolved in upwards of twenty gallons of clear water may be detected by a viſible blue tinge appearing on the addition of a few drops of volatile alcali, yet this is by no means the caſe in turbid high-coloured liquors, [...] Hence the neceſſity of diluting ſuch liquors in varying the experiments. In no inſtance did the blue tinge appear with the alcalis, even after the wine was diluted, and yet its abſence does not prove the liquor to be abſolutely free from an impregnation of copper.

And when we consider that other theory of the natural philosophers, that all other earthly hues—every stately or lovely emblazoning—the sweet tinges of sunset skies and woods; [...] all these are but subtile deceits, [...]

The degree of vividness of a colour; hue, shade, tint.

[page 51] The following are the results of experiments made with rhubarb, to ascertain the best modes of detecting it in the urine and blood, and the time it takes to pass from the stomach to the urinary bladder. [...] [page 52] In 17 minutes, half an ounce of urine was voided, which when tested had a light tinge. In 30 minutes another half ounce was made, in which the tinge was stronger; and in 41 minutes a third half ounce was made, in which it was very deep. In an hour and ten minutes 7 ounces were voided, in which the tinge of rhubarb was very weak, and in two hours twelve ounces were voided, in which it was hardly perceptible.

A draper's or clothier's markup.

A retail house […] are in the habit of cutting up, say, a fourpenny Croydon, into dozens; these dozens are marked four shillings and threepence, with one penny "tinge;" so that the privileged customer pays threepence more for the calico "marked up cheap!" […]

To add a small amount of colour; to tint; (by extension) to add a small amount of some other thing.

[T]he water being ting'd red, cant it off, iterate it ſo long till the Vitriol tingeth the water no more.

A Saline liquor therefore, mixt with another ting'd liquor, may alter the colour of it ſeveral ways, either by altering the refraction of the liquor in which the colour ſwims: or ſecondly by varying the refraction of the coloured particles, by uniting more intimately either with ſome particular corpuſcles of the tinging body, or with all of them, [...]

To affect or alter slightly, particularly due to the actual or metaphorical influence of some element or thing.

Hail! nurse of thought, with brow serene; / Who, as the sun, so wont, retires, / And leaves the sky to milder fires, / Tingest with shadowy forms the fading scene, [...]

For the very intensity of the light is all-consuming and it consumes this very vibration of the liar and his lie tingeing the word, the murderer and his murder tingeing their works!

To change slightly in shade due to the addition of colour; (by extension) to change slightly in quality due to the addition of some other thing.

[H]is virtues, as well as imperfections, are as it were tinged by a certain extravagance, which makes them particularly his, and distinguishes them from those of other men.

Taint is here a metaphorical expression. It means literally something which tinges. "The mean and malignant passions" are therefore, first of all, a substance which tinges. This substance which tinges "will creep."