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How can I be assured that Blue Wools from James Heal perform correctly?

James Heal Blue Wools are made in Germany and originate from DEK – The German Colour Fastness Commission. DEK hold the global master standards.

Every batch of Blue Wools 1-7 is rigorously tested for conformance against ISO 105 - B08.

These tests are:

  • Instrumented assessment of evenness of the dye
  • Instrumented and visual assessment of the fading characteristics

Blue Wool 8 is not suitable to be tested in this way as the time taken to fade to a grade 3 and 4 would be too great and not time effective.

A more efficient method for Blue Wool 8 is currently being devised.