Natural dye will work well on natural fabric that's not a secret.A lot of fabric available today are blend even if sometimes they say they are 100%.Most of costumer buy fabric which do not required dye but sometimes when you want a specific shade of blue for example , it may be hard or impossible to find.Making a test is always a good idea.
How it work
The plant must be crush and put in a bag to make an infusion.It's like making a tea.You put your tea in the bath and add the mordant.Mordant is a substance which will help to fix the color to the fabric and will reveal the color it self.To have successfull result you should use a specific amount of fabric , water , plant and mordant.The fabric must be wet before entering in the bath and should stay in for a moment.The fabric must have been previously wash .A detail like this can change completely the result.The temperature can have effect too.
The main material to make it are : a pair of glove , pestle and mostar, plants , gloves, muslin bag , balance , a bath or something equal , old black clothing to wear ,a stopwatch , a mask , water , thermometer and a mordant .You may required more then this but it's a basic need , ex you may need more then one pair of glove.
Mordant will fix the color.A mordant should be use with the right plant .It product a reaction between them .It's like ice cream and pie , they love each other.Ice cream don't like to be on the top of a hot coffee.It's the same idea.Mordant like alum and ferrous sulfate are available at the drugstore.Copper,chrome and tin should be buy from a supplier because they are very poisonous.They required to be handle very carefully .
Each plant on this earth cannot be use but there is a lot of choice.Making a complete list will be too long .I make a quick list of easy and common to find.
Elder leaves or berries
Even if it seem complicated , making natural dyes could be a great experience.Read more on the subject and find recipe you could follow.Remember to always wear some old clothing , I do prefer black for it.Use your mind , if for some reason the recipe skip a step or may put yourself in danger , don't do it.Some mordant are real poison, no joke.Be carefull and take all the time it need to make the experience a success.No rush or pressure. I have no book to recommend for the moment , the one I have is too much incomplete .If someone know one or know a solid ressource , feel free to mention it as a comment .