Botanically known as Juglans regia
Coming from the words Jovis (Jove) and glans (acorn), while regis means royal. It has a smooth trunk with light grey bark. It has light green flowers and a fruit that is large, round, green nut with a husk.
Part of Plant Used
The husks, leaves and bark of the branches are used as dye colourants.
They prefer to grow in deep soil and cool conditions. Its origin is expected to occur from Minor Asia. They were introduced in China by its emperor in 2nd Century BC.
Dyeing with Walnut Hulls
It is called to be living laboratories of dye production. Walnut is a substantive dye, meaning that it does not require a mordant to give out its colour on the fabric. It is used in combination with many other dyes and works very well with iron to produce greys/browns.
* Also can be used as Soap Making Colorant and Candle Making Colorant.