I will have a go but there is a much better explanation on a previous page by GTgirl500 if you want to go and look !!!
So here goes you have an original pair of mud (mud 1) and blazing (blazing 1) and you breed those 2 until you get a new mud and a new blazing then call this pair (mud2) and ( blazing 2) now breed that new pair until you get another mud and another blazing then call these (mud3) and (blazing3) now repeatedly breed that 3rd pair until you get what your after ie the panlong !
It was originally used for rainbow using seaweed and firefly the theory is that after all that breeding both dragons are containing all the elements required but at a higher concentration !
I hope this helps and that I have explained it correctly ,and remember it's all about perseverance I'm learning that all over again trying to get the panlong lol ! Keep breeding !!!
Sent from my ipad2 GCID dragonville10