Matrix semi - advice please!

[Inspired]

I've just bought a matrix semi but I have forgotten to buy the activator. Do I need to go back & get it or can I just use a 3%? I've looked online & it says the activator is 2.7%. Just wondering if it will make a difference.

I've never used matrix before, I usually use Goldwell but I went to a different wholesalers.

 

[Bluerinse]

Yes you will need the activator for sync hun x

 

[Inspired]

Lovely. Thank you.