Laboratory test
The test was carried out in Miele washing machines (W1514) at a temperature of 40° C and with a water hardness of 15 dH. Photo: Tobias Meyer

Facts about the test

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A comparative laboratory test of liquid detergents available on the Danish market for coloured clothes was carried out by Testfakta on behalf of Unilever.

The test was performed in accordance with the European industry association AISE’s recommendations and consisted of two overarching components: a test of the detergents’ washing ability and a test of their colour-protection properties.

All test components were performed at a temperature of 40 degrees Celsius and in moderately hard water (15 dH). The detergent was dosed based on the recommended amounts for normally soiled clothes.

 

Cleaning ability

The cleaning ability was tested on a total of 26 different types of stains, which can be divided into four categories based on their composition: fat-based, bleachable, protein-based and special stains.

  • Fat-based stains include make-up, engine oil, cooking fat, lipstick and mascara.
  • Bleachable stains include tea, coffee, fruit juice, red wine, tomato paste, curry powder, white tea, grape juice and grass and mud.
  • Protein-based stains include grass, chocolate, mustard, carrot, blood, ice cream, cocoa powder and mayonnaise.
  • Special stains include red and brown silica sand, clay and potting soil.

AISE’s recommendations comprise 14 stains. In our test, we have supplemented these with a further 12 types of stain to gain a better assessment of the most common types of stain.

The results provided are the averages over six washes per detergent and type of stain.

 

Colour protection properties

The test of the detergents’ colour protection properties consisted of two aspects:

  • How well the detergent retained the specific shade of colour. Fourteen different shades (colours) of cotton and polyamide samples were evaluated.
  • How well the detergent counteracted discolouration. The discolouration of four different colours of cotton and polyamide samples was evaluated.

The results provided are the averages over ten washes per detergent and shade.

 

Overall evaluation

The results from the different components of the test were given ratings on a scale of 1 to 5, where 5 was the best.

The two overarching components of the test constituted the overall evaluation, in which the washing ability had a 60 per cent weighting, and the colour protection properties had a 40 per cent weighting. In the evaluation of washing ability, fat-based stains had a weighting of 19 per cent, bleachable stains 35 per cent, protein-based stains 31 per cent and special stains 15 per cent. In the evaluation of the colour protection properties, the colour shade had a 70 per cent weighting and discolouration a 30 per cent weighting.