What is Martius yellow used for?

Martius yellow stains have been used to stain erythrocytes yellow so that they contrast well with red fibrin in trichrome staining methods such as Lendrum’s Picro Mallory and Slidder’s Martius, Scarlet and Blue (MSB). It can be combined with other small molecular weight yellow dyes to increase stain intensity.

Is Martius yellow a nitro dye?

Martius yellow is a coloured, pH ionisable, non-volatile, nitro-aromatic dye (see Fig. 1).

What functional group on Martius Yellow is responsible for binding the dye to the wool?

A naphthol in which the hydroxy substituent is at C-1 with nitro groups at C-2 and -4. Martius yellow is an organic compound that once was used to protect wool from moths. It is prepared by nitration of naphthol.

Is Martius yellow an azo dye?

It is not an azo dye, rather it is an organic dye. Martius yellow is a yellow coloured organic compound which has poor light-fastness.

How are dyes prepared?

In the process of dyeing, the sulfate anion (negative ion) is replaced by a dye anion. In the dyeing of wool, silk and synthetic fibers, hydrogen bonds are probably set up between the azo, amino, alkyl amino and other groups and the amino Co-NH-groups.

Why does wool dye so well?

Wool is a protein—a naturally occurring polymer made up of amino acid repeating units. The presence of many charged groups in the structure of wool provides excellent binding sites for dye molecules, most of which are also charged.

Which of the following is not azo dye?

Indigo is a natural dye which is extracted from the plants and has a distinctive blue colour. It is not an azo dye, rather it is an organic dye.

What is dyeing process?

A dyeing process is the interaction between a dye and a fibre, as well as the movement of dye into the internal part of the fibre. Generally, a dyeing process involves adsorption (transfer of dyes from the aqueous solution onto the fibre surface) and diffusion (dyes diffused into the fibre).

What are basic dyes?

Basic dyes are water-soluble cationic dyes that are mainly applied to acrylic fibers, but find some use for wool and silk. Usually acetic acid is added to the dye bath to help the uptake of the dye onto the fiber. Basic dyes are also used in the coloration of paper.