Caption: Freshly harvested sumac leaves (left) are boiled in a stainless steel pot and then strained to create a tannin mordant
bath for skeins of yarn (right).
The mordant fabric was instantly added in staining solution at 80degC for 25min.
For the fixation of color, some chemical and natural substances were used as mordant to impart color.
Mordants have played their useful role in improving the light fastness properties of the cotton samples with natural dye.
It is very important not only to select proper mordants but the adoption of suitable dyeing procedure is also a crucial step in optimizing the fastness properties of natural dyes.
They are astringent and serve both as mordant and dye, like the gall nuts used in Europe.
Myrobalan is also used for dyeing; its yellow colour is due to the tannins but also to flavonoid colorants (mostly 3'-methoxy quercetin and 3',4'-dimethoxy quercetin), (6) and its hydrolysable tannins combine with iron mordant to give black.
Parallelement, au remplacement des composants dans les mordants se produit aussi, une evolution technique de la gravure.
Cette tendance que nous avons deja assuree signifie une recuperation des materiaux et des procedes du passe, -etant donne qu'en plus des mordants elabores avec des sels et sulfates- concerne aussi a d'autres produits et procedures, telles par exemple: nettoyer la plaque tintee avec de l'huile et du savon, et la degraisser avec du sel et du vinaigre ou avec de la poudre de talc melange avec de l'eau entre d'autres.
which has anthocyanin chromophore after it was mordanted
with nine different mordants
nobilis were prepared from aqueous solution with alum and iron mordant
Because the Mayan and Aztec dyeing methods had not been preserved, European dyers did not initially understand that dyeing with logwood extract required treatment with a metal salt, called a mordant
A good standard mordant
is made of two tablespoons of powdered alum, the kind used for pickles and one half a tablespoon of cream of tartar, dissolved in half a pail of cold water.
The secret of chintz-making lay in the dyer knowing which mordants
or metallic salts to use and in what strength to produce specific colours by predicting their reactions to particular dyestuffs.
The slight improvement in nuclear staining as compared to when the extract was not mordanted
could be attributed to the possible formation of a mordant
and dye complex known as a 'dye-lake'.