This part of ISO 105 specifies methods intended for determining the resistance of the colour of textiles of all kinds and in all forms to domestic or commercial laundering procedures used for normal household articles using a reference detergent incorporating a low temperature bleach activator. The colour loss and staining resulting from desorption and/or abrasive action in one single test closely approximates to one domestic or commercial laundering. This method does not reflect the effect of optical brighteners present in some commercial washing products. Annex A of this procedure incorporates the use of ECE 1) . Non-Phosphate Reference Detergent, sodium perborate tetrahydrate, and the bleach activator tetra-acetylethylenediamine, (TAED). An alternative test procedure using the AATCC 1993 Zero Phosphate Reference Detergent (without optical brightener), and incorporating sodium perborate monohydrate and the bleach activator, sodium nonanoyloxybenzene sulfonate (SNOBS) is currently under development. 1) European Colourfastness Establishment (ECE), BAM, Unter den Eichen 87, D-12203, Berlin, Germany.