RUMBLETiGER
Adventurer
A thought occurs to me.
You have to actually touch the enemy - that means if you wear gloves, or strike him with another body part that's covered with clothing, the hit doesn't count. The average adventurer is stuffed to the gills with magical bling, which prevents him from truly making use of the feat. Thus, until you describe in painstaking detail where every bit of gear and clothing your character has is located, you won't do a thing with the Touch of Golden Ice feat.
First of all, if you touch the armor of the creature instead of the creature, it still works? I would say no...or every time someone used unarmed strike we would roll against normal AC for normal damage and touch AC for that ability. It just feels wrong. However I am not sure either.
Here is how I'd DM this:
This is for all intents and purposes a contact poison, secreted through your own skin.
So, you punching while wearing gloves will not have the effect. You punching the opponent in combat bare handed, mechanics-wize, the player can simply assume he hit some portion of bare flesh, a face, an arm, whatever, no declaration of "I'm aiming for his exposed elbow" would be necissary. If you're punching wearing spiked gloves, no effect, just as a poison that was applied to the inside of a spiked glove wouldn't harm the enemy.
Out of combat, if the PC shakes hands with the skeevy villain-in-disguise and said villain is wearing gloves, RP-wise the villain is most likely not affected.