CAN/CGSB 4.2 NO. 19.1-2004 (R2013) ✓ Most Recent

This method contains five accelerated tests for determining the colourfastness to washing of textile fabrics, threads and yarns. Each test is designed to produce in a single treatment the colour change to be expected after five average home or commercial washings under one of five commonly used sets of conditions.

The five tests contained in this method are:

• Test No. 1 — For textile materials that are expected to withstand repeated hand washing, or equivalent gentle machine washing at lukewarm temperatures (40 ± 2°C).
• Test No. 2 — For textile materials that are expected to withstand repeated machine washing at moderate temperatures (50 ± 2°C) in the home or in a commercial laundry.
• Test No. 3 — For textile materials that are expected to withstand repeated machine washing at high temperatures (70 ± 2°C) without bleach, in the home or in a commercial laundry.
• Test No. 4 — For textile materials that are expected to withstand repeated machine washing at high temperatures (70 ± 2°C) in the presence of hypochlorite bleach, in the home or in a commercial laundry.
• Test No. 5 — For textile materials that are expected to withstand repeated hand washing, or equivalent gentle machine washing at cool temperatures (30° ± 2°C).