The NHS page on hair dye allergy, symptoms, precautions and what to do on suffering a reaction:
British Association of Dermatologists
A website with resources and information on topics including patch tests and contact dermatitis:
The British Association of Beauty Therapy & Cosmetology.
A useful resource for finding trained and qualified beauty therapists:
A charity dedicated to supporting those with allergies:
Supporting people at risk of severe allergies:
Wella Stories - Colour
Blog posts on a variety of hair colouring topics.
Josh Wood Colour
Tips, tricks and advice on colouring hair.
L’Oréal Hair Colour Advice
Articles on hair colour terminology and techniques.