from The Century Dictionary.
- noun The act or process of decoloring or depriving of color.
- noun Absence of color; colorlessness.
from the GNU version of the Collaborative International Dictionary of English.
- noun The removal or absence of color.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun Alternative spelling of
Sorry, no etymologies found.
I find it amazing that after all that they can correctly use the word “decoloration.”
The bleaching (decoloration) is also necessary as pretreatment method of some soap making fat with initial strong coloration.
The section on soil temperature deals with the effects of surface residue: changing the radiation balance accompanied with an insulation effect, and with residue factors involved in these effects: residue age (decoloration; decomposition), color, geometry, distribution and amount.
If there is no possibility to exactly gauge the temperature, it must be estimated by means of the decoloration of the workpiece effected during heating.
To discriminate between the two latter, test with solution of caustic soda, when decoloration or change of color will indicate aniline blue and permanence will indicate presence of indigo blue.
To distinguish between them apply solution of hydrate of lime, whereby a change to gray, followed by complete decoloration indicates logwood, and a change to violet-blue, orchil.
Prussian blue, aniline blue and indigo blue are to be tested as follows: Solution of chloride of lime, no change of color for prussian blue; decoloration or faint yellow for aniline blue or indigo.
Reliance on the accuracy of the process cannot rest upon the supposition that the cyanide required for decoloration is proportional to the copper present, for varying quantities of ammonia salts, ammonia and water, and differences of temperature have an important effect.
Measure 10 c.c. of the clear liquid and add 20 c.c. of a 10\% solution of potassium iodide, 2 c.c. of acetic acid or hydrochloric acid, then put drop by drop into the mixture a decinormal solution of sodium hyposulfite (2. 48\%) until decoloration.
The decoloration speed is thousands of times faster than conventional materials.