List of colors not to use in stck stacks

[bigj402]

Im not sure of what all colors to watch out for when doing stick stacks but I know lochness and onyx are one that just seem to crack alot and its driving me nuts casue when im working a heady all of a sudden without warning it cracks and its not like I touched it with a little heat it just cracks question is it color or my error

[MUPH]

You need to watch any chrome color when encased (lochness, anyobtainium). Also if its cracking it might not be melted in enough when your pulling your stack or it might be too cold, make sure to garage between working pieces.

[loydb]

Borostix Brown cracks like mad.