A sachet for washing fabrics, in particular colored fabrics includes a surrounding bag (1), containing an inner bag (2) within a first space (Vl). The surrounding bag (1) is permeable to a washing liquid (5) and absorbs possible particles (4) of coloring dye present in the washing liquid (5) during the washing of the fabrics. Inside the inner bag a second space (V2) is delimited and contains an additive (3) to be released, during the washing and dissolved in the washing liquid (5) .
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