
SlimGauge |

SlimGauge |

I don't think they stack, but I don't have a good rules reference yet.
Basically, spells do what they say they do, but no more.
Spell A grants a touch attack
Spell B grants a touch attack
This does not mean that you can do both as the same action, unless the spells say so (the way the rules specifically say you can deliver a touch spell with an unarmed strike).

Blakmane |

Jason Nelson, who wrote calcific touch, mentions you are still holding the charge with it. Linky. He specifically calls out casting calcific touch/shocking grasp together as impossible due to the holding the charge rules. The same rules don't apply to elemental touch though.
Thus, slimgauge's assertion is correct - you can't cast a spell while using calcific touch or you lose the charge.
*edit*
changed to reflect that elemental touch does indeed work with other touch attacks.

Gauss |

Lithras, Calcific Touch and Shocking Grasp are both touch spells (have a target of "Touch"), if you cast another spell while you have a held touch spell then it voids the touch spell. You cannot have both active at the same time.
Elemental Touch is not a touch spell, you can cast that first and then cast either Calcific Touch or Shocking Grasp and the effects of both spells (Elemental Touch and one of the other two) will be in effect.
Blakmane, Elemental Touch is not a touch spell, it has a target of "You".

Lithras |
I suppose the confusion with calcific touch was that "1 creature/level", it was translated by many that the caster actually bestows them the ability to use a touch attack :P It's all clear about it now.
Elemental Touch is a completely different story, however, it has a "Range personal", "Targets: you". RAW, it is a spell providing a touch attack, and not a touch attack spell by itself (Jason Nelson mentions it as being "the oddball" in your link).

Blakmane |

Lithras, Calcific Touch and Shocking Grasp are both touch spells (have a target of "Touch"), if you cast another spell while you have a held touch spell then it voids the touch spell. You cannot have both active at the same time.
Elemental Touch is not a touch spell, you can cast that first and then cast either Calcific Touch or Shocking Grasp and the effects of both spells (Elemental Touch and one of the other two) will be in effect.
Blakmane, Elemental Touch is not a touch spell, it has a target of "You".
Yep you're correct. Reading elemental touch, it simply adds to your damage (or gives you a new attack) rather than being a held charge rider. I'll edit my post to reflect this.

Blakmane |

Gauss wrote his reply while I was writing mine, exactly what I thought :) So, elemental touch + either of the others will do the trick 3:) Are you guys aware of any additional spells to add to the combo for a devastating "alpha" bite?
Elemental touch doesn't work with bite: "You also deal energy damage and the related special effect when you attack with your hands using an unarmed strike, a single claw, or a single slam attack. "
So I guess, alpha claw?