Semi-permanent vegetable dyes, such as henna, are a good choice, but study the label - some products billed as 'natural' also contain strong chemical dyes.

Its decline came when chemical dyes were discovered.

The dyeing industry has decayed with the introduction of chemical dyes.

Using locals technical knowledge of chemical dyes, the industry grew bigger than ever at the turn of the 20th century.

But the invention of chemical dyes put the indigo industry out of the business scene.