Pauline - Welcome!!
We're in the UK too, and I've never heard the thing about colours. Then again, I've got a HV who hasn't heard of BLW, and am already convinced that there is absoltuely no consistency in any of the advice people get given in different places!! My understanding of BLW is that, aside from avoiding the really obvious risk-foods (honey, peanuts etc), you just offer them whatever you think sensible and see what they go for.
On sterilization, I don't see any need to sterilize 'food' related things for her since EVERYTHING she can lift goes in her mouth at the moment... toys, clothes, other people's fingers (!) none of which are sterile.
According to my HV, the only thing we need to worry about sterilising at this age is bottles/teats/anything in contact with milk. I believe that this is because it is such a nutritious liqud that nasties bug and germ type things grow in it very happily!
Anyway - after lurking here for AGES I think the time has come to actually start DD on solids - DH is on holiday this next week so will be at home with us, and since he is bound to miss lots of her 'firsts' I thought it would be nice to share this one with him. And he will be on hand if we have any choking (sorry, I mean gagging!!) to deal with
She's only 2 weeks off 6 months, and is showing much interest in food, and enjoys sitting in her high chair watching my eat, whilst chewing her own spoon!! So, now seems the time! Wish us luck ...