Italiano: Precipitato ottenuto aggiungendo ammoniaca ad una soluzione di solfato di ferro(II) e cromo(III). Risaltano solo l'idrossido ferroso (blu-verde) e ferrico (marroncino). Il filtro è carta assorbente (Scottex). Ulteriori informazioni: LCC.
English: Precipitate of iron(II), iron(III) and chromium(III) hydroxides. The filter is made of porous paper (Scottex).
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