Casting Creme Gloss - patch test essential?

[NewChoos]

Have a few straggly greys and not booked into hairdresser until November so thought I could try this until then.
Is the patch test essential? have had hair dyed every few months with no reactions at the hairdressers.

[HettyAmaretti]

Yeah, you really should. The first time at least. Sorry.

[NewChoos]

Thank you. Do you have to do a patch test each time if you are using the same product?

I think I may just have to con ask DH to look after DS Sat am so I can get to the hairdressers and tie my hair back until then.

My greys have got so much worse since having DS and he's only 7 months!

[psammyad]

AFAIK you are supposed to do a patch test each time, even with the same product in case you have developed an an allergy since the last time - occasionally a reaction can be caused by repeated exposure.

I've wondered why hairdressers don't generally do patch tests - are the dyes different or is it just that they'd know what to do if you had a severe reaction? (extremely rare but does happen www.dailyrecord.co.uk/news/scottish-news/2011/10/13/teenager-dies-in-agony-20-minutes-after-dyeing-her-hair-86908-23485448/.)

Used to get my hair coloured at the Vidal Sasson academy (by students) & they were very strict about patch tests if you hadn't had your hair dyed within the previous six months - but I've never had another hairdresser suggest it.

[psammyad]

(Sorry didn't mean to hijack your thread with a horror story - it really is very, very rare but so sad for the young girl above who'd dyed her hair loads of times with no problem by the sounds of things & was just terribly unlucky).

[NewChoos]

Oh no far better to be warned!
Do you just use a bit from the pack for the patch test?