Using another alchemest's mutagen...

[baalbamoth]

ok, it says that an alchemist can use another alchemist's mutagen, well, if you have "infused mutagen" does that mean that the mutagen is treated like a potion for the new alchemest? IE he can carry it around forever and take it whenever he pleases? maybe even use alchemical allocation?

IE Fizzgit is an alchemst aprentice (lev 1) his master spends the 1,000 gp and gives him an infused feral grand mutagen.

1)does this mean when he uses it the aprentice gets grand mutagen stat boost with the claws and fangs?

2) how long does the effect last (as long as a 20th level alchemist's grand mutagen? or does it only last as long as the 1st level mutagen lasts?)

3) when does he have to take it by? or when does it go innert or does it ever go innert (because another alchemist now possesses it and is empowering it?)

[Umbranus]

My interpretation would be:
1) Yes
2) Depends on the creator's level.
3) Should not go inert

[Christopher Woldridge]

1) Yes
2) As long as the creators mutagen would last.
3) It is innert when not in the hands of "an alchemist". "A infused mutagen persistes on its own" so it is only innert when not in the hands of "an alchemist".

Mutagen and Infuse Mutagen from the PRD. Bold is mine.

PRD:

Mutagen (Su): At 1st level, an alchemist discovers how to create a mutagen that he can imbibe in order to heighten his physical prowess at the cost of his personality. It takes 1 hour to brew a dose of mutagen, and once brewed, it remains potent until used. An alchemist can only maintain one dose of mutagen at a time—if he brews a second dose, any existing mutagen becomes inert. As with an extract or bomb, a mutagen that is not in an alchemist's possession becomes inert until an alchemist picks it up again.

When an alchemist brews a mutagen, he selects one physical ability score—either Strength, Dexterity, or Constitution. It's a standard action to drink a mutagen. Upon being imbibed, the mutagen causes the alchemist to grow bulkier and more bestial, granting him a +2 natural armor bonus and a +4 alchemical bonus to the selected ability score for 10 minutes per alchemist level. In addition, while the mutagen is in effect, the alchemist takes a –2 penalty to one of his mental ability scores. If the mutagen enhances his Strength, it applies a penalty to his Intelligence. If it enhances his Dexterity, it applies a penalty to his Wisdom. If it enhances his Constitution, it applies a penalty to his Charisma.

A non-alchemist who drinks a mutagen must make a Fortitude save (DC 10 + 1/2 the alchemist's level + the alchemist's Intelligence modifier) or become nauseated for 1 hour—a non-alchemist can never gain the benefit of a mutagen, but an alchemist can gain the effects of another alchemist's mutagen if he drinks it. (Although if the other alchemist creates a different mutagen, the effects of the “stolen” mutagen immediately cease.) The effects of a mutagen do not stack. Whenever an alchemist drinks a mutagen, the effects of any previous mutagen immediately end.

Infuse mutagen: When the alchemist creates a mutagen, he can infuse it with an extra bit of his own magical power. This inflicts 2 points of Intelligence damage to the alchemist and costs 1,000 gp in rare reagents, but the mutagen created persists on its own and is not rendered inert if the alchemist creates another mutagen. This allows an alchemist to create different types of mutagens and keep them handy for emergencies. This does not allow an alchemist to gain the effects of multiple mutagens—only the most recently imbibed mutagen has any effect.