BS 1006:1990 download free.Methods of test for Colour fastness of textiles and leather.
1 Scope
This part of ISO 105 specifies an instrumental method for assessing the degree of staining of adjacent fabrics in any fastness test, as an alternative to the visual method.
2 Normative references
The following standards contain provisions which, through reference in this text, constitute provisions of this part of TSO 105. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this part of ISO 105 are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. Members of TEC and ISO maintain registers of currently valid International Standards.
ISO 105-F 10:1989, Textiles — Tests for colour fastness — Part FlO: Specification for adjacent fabric: Multifibre.
ISO 105-JO 1:1989, Textiles — Tests for colour fastness — Part JOl: Measurement of colour and colour differences.
3 Principle
The colour of an adjacent fabric which has been subjected to a fastness test in contact with the fabric under test and that of a specimen of the adjacent fabric which has been subjected to the fastness test in the absence of the fabric under test are measured. The colour difference between them is calculated in CIELAB units and converted to a staining-scale rating by means of a simple equation.
4 Apparatus
Spectrometer or colorimeter, capable of measuring the colour of a specimen of the size of one stripe in a multifibre adjacent fabric (see ISO 105F10) and which irradiates the specimen with light resembling that of standard illuminant D65 or standard illuminant C.
5 Test specimen
Mount the adjacent fabric which has been subjected to a fastness test, together with a specimen of the adjacent fabric which has been subjected to the fastness test in the absence of the fabric under test, on non-optically-brightened white card stock.
6 Procedure
6.1 Measure the colour of the piece of adjacent fabric which has been subjected to the fastness test in the absence of the fabric under test.
6.2 Measure the colour of the adjacent fabric which has been subjected to the fastness test as part of a composite specimen. If the staining is uneven, several measurements shall be made and the arithmetic mean value employed in the calculations. If the instrument permits different viewing geometries to be used, the preferred method is to include the specular component.
6.3 Calculate the colour difference &EcIEB and the magnitude of the lightness difference ALcrEIB between the adjacent fabrics, as described in 6.1 and 6.2. to two places of decimals. Either of two CIE instrument geometries may be used:
a) sphere (diO°), specular included;
b) O°145° or 45°IO°.
Calculations shall be performed using the CIE 100 observer and illuminant D, with the 2° observer and illuminant C being a permitted alternative.
6.4 Calculate, to two places of decimals, the grey-scale difference AEGS equivalent to cIEIAB using the following equation:
6.5 Calculate, to two places of decimals, the staining-scale rating (SSR) using one of the following equations:
If SSR is greater than 4, recalculate using the following equation:
6.6 Determine from Table 1 the staining-scale rating to be reported.
7 Test report
Include the staining-scale rating (instrumental) from Table 1 and a reference to this part of ISO 105 in the test report of the colour fastness test concerned.