Beware they've changed the formula.
It will not come out smoothly or spread well.
I've been using the 6.3 for years in my roots and always had success.
Tried one of the 3 boxes I had in my cupboard today.
Thought hang on it's not at all runny and then despite it being a warm tone it came out of the bottle a sludgy green.
I've rung to complain but still waiting an email. Lady was helpful but couldn't do much, which I expected but just wanted to let customer service know.
She said I'm not the first, and there are other reviews I'm finding to the same effect.
I used the 6.3.
Not sure if they've repackaged and changed the formula across the range.
I've now got pale orange roots as had to get it washed off asap!@
The shame.