Update docs/assignments/week04.md

docs/assignments/week04.md

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 Reference Book: "Le monde des teintures naturelles" by Dominique Cardon. 
 
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 ## Preparing the fibers
 
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 Adding color directly in the printing paste will make an ink. 
 
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 ## Documenting experiments
 
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 ##### TEST 01 - SILK
 
 _Material name_ | _Fabric composition_ | _Breathability_ | _Moisture-wicking abilities_ | _Heat retention abilities_ | _Stretchability_ | _Washing temperatures_