Deciding between Adore Cinnamon and Sienna Brown

What is your base colour? I've not used Sienna Brown or cinnamon but I would have taken Sienna to be that kind of colour. I usually use Mahogany, which is darker and with an almost red/violet tinge and Paprika which is quite a bright auburn and quite often I mix them to create different auburn shades. (I use them over a dyed brown base)

Thanks for the affirmation 🙂 My roots are a level 8-9 cool blonde, ends are a mix of light steel blue and white. It probably wont be very pretty just after one colouring, but I'm willing to try and reapply as many times as it's necessary. The blue is so faint that it's hard to see the tinge if not in direct sun light, we'll see if it will interfere  *puzz* I've tried to get rid of the blue but it's pretty much stained...

I take it your roots are bleached/ dyed? I find Adore sticks nicely to dyed hair but doesn't stick to my natural roots when they grow through. You might need a bit of trial and error to get the right shade but they are all intermixable so you can always add other shades to make the one you want. The blue could in theory counteract some of the orange shades in the auburn but if it is very light it might not make much difference at all. You might find you have to apply a couple of times to get the rich coverage you want over such a light base, I found mine faded fairly quickly over a bleached base (But I was trying to achieve something quite a bit darker than you are)and eventually I used a permanent brown dye as the base but it did damage where the bleach was.