Saw a woman on the train with lovely 'Kate Middleton' long hair and while touching up her make up she was also took out a tiny gold coloured bottle ( hand gel size) of serum which she kind of rubbed through her hair.
The only sort I have is Organix and it's a biggish bottle - about 100mls- to be used on damp hair pre-drying.
What might the train woman have been using?