With each colour you apply gently drybrush the surrounding rock to get the OSL working. This is important as it's a bugger to go back and mix the colours again. These should be VERY light drybrushes. if you can't highlight your fingerprint on your hand you've too much paint on the brush!
Working as quickly as you can start to add Blood red to the mix in increasing amounts. Every time you add BR, reduce the are you paint to get the glow started.

Now begin to add Blazng orange in the same fashion. Keep reducing the area you paint. With each colour change you kinda mix it with the previous finishing colour and work up to the next one. It's important to work fast but as you are dealing with pretty small areas you don't need lots of paint.

Work up through Fiery Orange and Golden yellow. All the time reducing the area you paint. By this stage I've dropped from a 2/0 brush to a 000!

You will note that at this stage I decided to add more Blood Red. It's important to get the balance of colours right and sometimes it takes some fiddling. I used very dilute paint for this to help it blend in.
For the smallest areas of highlight add some white to the Golden Yellow and work up to pure white. The white bits should just be very fine dabs.

Go back and paint the edge of the base. This part really makes the effect take shape I think.


After this I'll normally add some washes to the rocks (Leviathan Purple etc) to make them stand out.
More to come soon.