Question: what shampoo ingredients are bad for dyed hair?
Answer: Ammonium Lauryl Sulfate or Sodium Laureth Sulfate (SLES) What are sulfates? ... 
Sodium Lauryl Sulfate (SLS) ... 
Parabens. ... 
Sodium Chloride. ... 
Polyethylene Glycols (PEG) ... 
Formaldehyde. ... 
Alcohol. ... 
Synthetic Fragrances.