*3.2.1.2 Mordanting*

Dyeing of pre-mordant of bamboo fabric, pre-mordanting treatment was conducted using mordant. Bamboo fabric samples were pre-mordanted of bamboo was carried out with mordant at concentrations on the weight of fabric:

• *Brightening mordant*:

Alum (aluminum potassium sulfate): 25% by weight of fabric

Tin (stannous chloride): 3% by weight of fabric

Chrome (potassium dichromate): 1% by weight of fabric

• *Dulling mordant*:

Copper (copper sulfate): 3% by weight of fabric

Iron (ferrous sulfate): 5% by weight of fabric

At 60–90°C for 30–60 min with material to liquor ratio as 1:30. After mordanting the samples were rinsed in cold water to remove the excess of mordant and used for dyeing (**Figures 4** and **5**).
