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There is a Legacy version here.

PFS StandardSilvertongue MutagenItem 1+

Alchemical Consumable Elixir Mutagen Polymorph 
Source Player Core 2 pg. 290
Usage held in 1 hand; Bulk L
Activate [one-action] (manipulate)
Your features become striking, and your voice becomes musical and commanding, though emotion clouds your reason.

Benefit You gain an item bonus to Deception, Diplomacy, Intimidation, and Performance checks. Your critical failures with any of these skills become failures instead.

Drawback You take a –2 penalty to Arcana, Crafting, Lore, Occultism, and Society checks. Choose one skill in which you're trained; for the duration, you become untrained in that skill.

PFS StandardSilvertongue Mutagen (Lesser)Item 1

Source Player Core 2 pg. 290
Price 4 gp
Bulk L
The bonus is +1, and the duration is 1 minute.

PFS StandardSilvertongue Mutagen (Moderate)Item 3

Source Player Core 2 pg. 290
Price 12 gp
Bulk L
The bonus is +2, and the duration is 10 minutes.

PFS StandardSilvertongue Mutagen (Greater)Item 11

Source Player Core 2 pg. 290
Price 300 gp
Bulk L
The bonus is +3, and the duration is 1 hour.

PFS StandardSilvertongue Mutagen (Major)Item 17

Source Player Core 2 pg. 290
Price 3,000 gp
Bulk L
The bonus is +4, and the duration is 1 hour.