Process 

Pre processing of fabric is quite laborious when dyeing with natural resources.

Cotton needs extensive pre processing while silk can just be soaked, in hot water for about 5-6 hours . The soft dye materials like flowers, petals should be soaked for at least 5-10 hours to get the best results. While the hard materials like barks or roots should be soaked for at least 2-3 days to get a good colour. 

Mordanting is application of a mordant a salt which helps in fixing the dye on the fabric like alum, iron, copper, etc. 

Alum should be used as a pre mordant, while iron is best as a post mordant.

Mordanting should be ideally done for about half an hour, and than the fabric should be dried without washing. 

Dyeing can be ideally done for half an hour, when working with soft dye materials like flowers or fruit rinds etc. While it might take 2-4 hours for something like lac to get a good deep colour. 

Most of the natural dyes can be dyed using a direct method, that’s boil the dye material add the fabric, move it constantly and than wash the same. 

Certain dyes like indigo and Al have a more complicated process. 

After dyeing the fabric needs to be washed thoroughly to remove all excess colours.