Irradiated Undercoat

Irradiated Undercoat

(most) info from Wowhead)

You get the shirt during a Reclamation Rig Event as a drop

Once equipped and while doing a Reclamation Rig Event you are able to collect “Unstable Isotopes”, these will appear in your bag as green objects – they last for 3 hours
After getting 100 of these ‘use’ your shirt . It will become ‘charged’
It has a 24 hour cooldown after which you can recharge by redoing the event and collecting more of the isotopes. You can collect the isotopes before the shirt is off cooldown – just remember they only last 3 hours so do within three hours of shirt cooldown
After recharging 5 times your shirt ‘melts’ and you receive Irradiated Elementaling battle pet

So –
Using the shirt does 5 things.

1] It puts a buff on you called “Unstable Regeneration” which lasts for 30 minutes.
Threat generation is increased by 20%, Nature damage taken is increased by 5%,
and periodically heals the caster for 1% to 5% per 6 sec for 30 min.

2] It encases you in a translucent green glowing sphere which
lasts for 30 minutes.

3] It “consumes” 1 use of your shirt.

4] It “consumes” 100 Unstable Isotopes.

5] It causes your shirt to not be able to be used again for at least 24 more hours.

After you have used your shirt for the first time you have 4 remaining charges. You need to wait until the following day at the next available Reclamation Rig Event.

When the shirt has only one remaining charge on it and you use it, the shirt will remain in its equipment slot and be “melted”. You can now click on the Melted Irradiated Undercoat and receive the Irradiated Elementaling battle pet.