Water colour

Metsaelae T, Rask M. 1989. Mercury concentrations of perch, Perea fluviatilis L., in small Finnish headwater lakes with different pH and water colour. Aqua Fennica 19 41 6. 

Cellulose is a high molecular weight polymer of D-glucose with fi( 1 -4)-glycosidic bonds, found in plant fibres it is the major component of most plant tissues. Starch is another common polysaccharide, containing two polymers of glucose, amylose and amylopectin. It was used in some paint preparations and in the production of paper. Acid treatment of starch produces dextrins, which are used as adhesives and additives in water colour paintings. 

About 1775, J. Priestley 2 passed a series of electric sparks through atm, air confined in a suitable vessel over water coloured purple by a decoction of turnsole or archil. He found ... 

Sampler 2, in order to complete the water colour and suspended solids part of the field form, needs to determine these by filling a polythene bag (15 x 43 cm) with stream water and holding it up against the sky as a background to observe the water colour and opacity. 

Coloured Iron. Atramental Water, coloured like copper. 

Horstmann, U., 1983. Distribution patterns of temperature and water colour in the Baltic Sea as recorded in satellite images indicators for phytoplankton growth. Berichte aus dem Institut fiir Meereskunde Kiel, Vol. 106, 1, 147 pp. 

Copper acetates are used as pigments in oil and water colours. 

Landscape painter and water colour artist. Studied art at Washington and New York. Official American camouflage artist during World War I. Attached to the Bureau of Ships Camouflage Section from 1942 as a civilian consultant. 

If total P > 8 or 10 (xg/l, respectively, then a correction was made for humic substances using regional relationships between total P and water colour (absorbance of filtered water)... 

Dissolved Organic Carbon, Water Colour and Climate... 

DOC represents a large part of the carbon export of many upland catchments, and is the major source of water colour. It is a significant component of the upland... 

Pounds JB, Long GJ, Rosen JR Cellular and molecular toxicity of lead in bone. Environ Health Perspect 1991 91 17-32. Fothergill J. Observations on disorders to which painters in water colours are exposed. Medical Observations and Inquiries 1775 5 393-405. 

The colour of water is determined by a visual comparative method. It is compared with the colour of a solution of dipotassium hexachloroplati-nate(IV) and cobalt dichloride, or with a solution of potassium dichromate and cobaltous sulphate. Results are given in terms of mg of platinum per 1 1 of water. Colour (or its intensity) usually depends on the pH value of water, and therefore, it should be referred to this value. 

Exactly 1.5 ml of sealing liquid (boiled water coloured with dye) is introduced into the dilato-meter. After weighing the dilatometer to the nearest 10 mg, it is filled with the melted fat, stoppered and weighed again. 

Interference may be caused not only by all substances which render the water coloured or turbid, but also by sizeable quantities of organic... 

In Scheme 3, the alkalinity concentration is plotted against pH from Lake Horkkajarvi, in southern Finland (61°13 N, 25°10 E). Lake Horkkajarvi is a truly meromictic lake where water column mixing periods, due to homothermal conditions, are absent [26]. hi northern temperate zones, lakes usually circulate twice a year, i.e. in spring and fall, but in a meromictic lake permanent stratification separates the lake into two layers. The stabilising forces in Lake Horkkajarvi are high electrolyte concentration and the sheltered position of the landscape. The lake is 1.1 ha in area with a maximum and mean depth of 13 and 7 m, respectively. It is a humic lake greatly affected by the allochthonous carbon load the water colour in units of mg Pt 11 is >200. 

Hamilton, W. Bubbles, water colour drawing, circa 1790, Arthur Gibey Collection, see The Connoisseur, 72, 237 (Aug. 1925). 

The pigment was paler than natural azurite, but otherwise its stabdity and other properties are identical. At the end of the nineteenth century, Terry (1893) writes of blue verditer being d y blue and not very durable... used in water colour painting, closely resembles Bremen Blue in composition and manufacture pre-... 

Terry (1893) provides the following description of chicory brown This vegetable pigment is rich-coloured but lacks permanence. It is prepared by calcining roots, such as those of chicory, in vessels to which air is not admitted, from which then results a fine brown powder. This is boiled in water, and the solution is evaporated to dryness, yielding a brown pigment, which, being soluble in water, is sometimes employed by water-colour artists. ... 

Under the general heading of indelible brown ink, Salter (1869) describes a beautiful transparent brown for water-colour artists, known as Liquid Prout s Brown . It was seemingly named for the Bnghsh artist Samuel Prout (1783-1852). Salter implies that it was based on bistre or sepia qq.v.), but with less binding medium than the indelible ink. 

Winsor Newton (1930) Anon. Winsor Newton Descriptive Handbook of Modem Water Colour Pigments Winsor Newton, London (1930)... 

Pipettes filled with water coloured with methylene blue. 

Figure 6.7 The famous fountain experiment illustrates both the very high solubility of hydrogen chloride in water, and the fact that the solution is acid, (a) An inverted flask full of HCl is connected by a tube to a reservoir containing water coloured by blue litmus. By blowing down the auxiliary tube, this water is forced up the connecting tube into the upper flask containing HCl. (b) Because HCl is so soluble, the first drops of water dissolve the contents of the flask, leaving a vacuum, (c) Water then fountains in without further assistance, filling the vacuum and the flask and turning red as it does so because of the acidity of the solution and the presence of litmus.

---