[edetha]

Enchanting a pristine weapon with agility, then overwriting the agi enchant with power causes the pristine bonus to vanish.

I do not know what happens when pristine runs out.

Steel Gloves [WEAPON]
2130AC - Forged by Esoti Liam
"Sturdy steel gloves designed for unarmed fighters!"
Level Requirement: 100
Boost: +18power
[PRISTINE: 5 years remaining]

Esoti Liam has enchanted the Steel Gloves! (AGILITY ENCHANT)

Steel Gloves [WEAPON]
2130AC - Forged by Esoti Liam
"Sturdy steel gloves designed for unarmed fighters!"
Level Requirement: 100
Boost: +23power +5crit +5agi
[AGILITY GLYPH]  <---- note this is just agility, not exalted agility.  I did this to save energy.
[PRISTINE: 5 years remaining]

Esoti Liam has enchanted the Steel Gloves! (EXALTED POWER ENCHANT)

Steel Gloves [WEAPON]
2130AC - Forged by Esoti Liam
"Sturdy steel gloves designed for unarmed fighters!"
Level Requirement: 100
Boost: +35power
[EXALTED MAGIC GLYPH]
[PRISTINE: 5 years remaining]

As you can see, in the last picture, the power boost is 35. It should be 38.

I do not know what happens when the pristine bonus wears off.