I understand that it's wise to save blue charms for a higher level(not sure what level, can someone clarify?) but I have about 14k crimson, 10k green, 11k gold , and about 1k blue charms banked. Should I use up the golds first in order to use the crimsons on a higher level familiar? Golds are extremely slow xp and I hate using them, but if I should wait to use the crimsons then I will. I am currently 78 summoning and will be aiming for a unicorn and then a yak.