Hi
i had a hair dresser refuse to dye my hair due to the Metheltrexate, i have had and still do have patches of hair fall out and it goes thru stages of being quite dry so if you did want to you'd need to go to a Good hairdresser and have them use a Good Quality Dye and Conditioner and then you Keep the Conditioner regularly
as for me i just stopped dying mine
But Ah that Famous RA saying Everyone Reacts Differently