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Lightfastness is a property of a colourant such as dye or pigment that describes its resistance to fading when exposed to light. [ 1 ] [ 2 ] [ 3 ] Dyes and pigments are used for example for dyeing of fabrics , plastics or other materials and manufacturing paints or printing inks .
A rating between 0 and 8 is awarded by identifying which one of the eight strips on the bluewool standard card has faded to the same extent as the sample under test. [4] [5] Zero denotes extremely poor colour fastness whilst a rating of eight is deemed not to have altered from the original and thus credited as being lightfast and permanent.
Microfadeometry is a technique that uses tiny spots of intense light to probe and measure color changes in objects of art that are particularly sensitive to light exposure. [1] This process is completed using a recently designed instrument known as a microfading tester. The data from the test is represented by reflectance spectra.
In general, clothing should be tested for colour fastness before using bleach or other cleaning products. [3] Lightfastness, wash fastness, and rub fastness are the main forms of colour fastness that are standardized. The light fastness of textile dye is categorized from one to eight and the wash fastness from one to five, with a higher number ...
In the Print/export section select Download as PDF. The rendering engine starts and a dialog appears to show the rendering progress. When rendering is complete, the dialog shows "The document file has been generated. Download the file to your computer." Click the download link to open the PDF in your selected PDF viewer.
This is a temporary file for testing of correct rendering of PDF files. This file can be modified by anyone, to test their own PDF documents. If you suspect a problem with the rendering of your document, then upload it the first time here under the name Test.pdf. It's easier than delete an upload.
Fellow is an emulator designed to run software written for the Amiga computer platform. Released under the GNU General Public License, [1] Fellow is free software. Fellow was released shortly after the first usable release of the Unix Amiga Emulator (UAE). The competition between the two projects proved to be mutually beneficial.
Tired light hypothesis vs. expanding universe. The Tolman surface brightness test is one out of six cosmological tests that were conceived in the 1930s to check the viability of and compare new cosmological models. Tolman's test compares the surface brightness of galaxies as a function of their redshift (measured as z).