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The addition of white light will cause a desaturation of the monochromatic source, as perceived by the human eye. However, a less intuitive effect of the white light addition that is perceived by the human eye is the change in the dominant wavelength that dictates which color is observed, or change in hue. This simultaneous hue shift phenomenon cannot be measured by experimental instruments; it is only discernible in the eye.

. This variance of hue as a result of the addition of white light was first described by the English chemist and physicist Sir William de Wiveleslie Abney in 1909, although the date is commonly reported as 1910. A white light source is created by the combination of red light, blue light, and green light. Sir Abney demonstrated that the cause of the apparent change in hue was the red light and green light that comprise the white light, and the blue light component of white light had no contribution to the Abney effect.

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The Abney effect describes the perceived hue shift that occurs when white light is added to a monochromatic light source.

I remember, The Abney effect describes the perceived hue shift that occurs when white light is added to a monochromatic light source. Nice to know that this company has a history I can relate to.

Abney effect associates hue shift light source genuine or fraud?

Abney is an ancient Norman name that arrived in England after the Norman Conquest of 1066. The Abney family lived in or near the settlement of Abney in Derbyshire.

Spelling variations include: Abney, Daubney, Daubeney, Daubny, Daubeny, Dabny and others.
First found in the counties of Derbyshire and Norfolk, where they had been granted lands after the Norman Conquest in 1066 A. D.

Some of the first settlers of this name or some of its variants were: Thomas Dabney who settled in the Barbados in 1660; Thomas Abney settled in Maryland 1774; John Dabney landed in New York state in 1820.

Entry from the "History and Gazetteer of the County of Derby", 1829 by Stephen Glover.

ABNEY, (Habenai) is a small village and township seated in a deep valley, amidst high mountains, in the parish of Hope, and in the hundred of High Peak. It contained, in 1821, 23 houses, as many families, and 143 inhabitants. Twenty families are employed in agriculture, and three in trade. The township contains 1323 acres, 1 rood, 17 perches of gritstone land, which is divided between Humphrey Bowles, esq. And the Earl of Newburgh; viz. Abney ancient enclosure, consisting of 512 a. 3 r. 11 p. Is the property of Mr. Bowles; and Abney Grange ancient enclosure, consisting of 189 a. 1 r. 35 p. Is the property of the Earl of Newburgh, except about 14 a. 1 r. 35 p. Belonging to Mr. Bowles. Abney common, unenclosed, is 621 a. 0 r. 35 p. And belongs to the above named nobleman and gentleman, in right of their ancient enclosures; the annual estimated value is £687.10s. The tithe belongs to the dean and chapter of Lichfield. This township is under the constablery of Eyam, and is governed by a headborough.
In Habenai Swain had one carucate of land to be taxed. Land to one plough. It is waste. D. B.

At the Doomsday Survey this manor belonged to William Peverell; in the reign of Edward II. To the family of Archer; at a later period to a branch of the Bagshaw family, who sold it to the Bradshaws, in which family it remained nearly two centuries, when it passed by marriage to the Galliards of Edmonton, in Middlesex; the sister and co-heiress of the latter brought it to the late Charles Bowles, esq. Of Sheen, in Surrey, and it is now the property of his son, Humphrey Bowles, esq.

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