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Acid
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Belpren: This is a luminescent blue acidic substance does 1-12 (1d12)  damage instantly upon skin and internal tissues (No save). Further applications of Belpren will not cause any more damage to the effected area, but the damage given above is for a roughly hand-sized area of exposure; for each additional area exposed, add an additional 1-12 (1d12) damage. However, no damage will be taken if used internally (As Ingestive poison), it will cause only immediate and involuntary vomiting. Belpren will not corrode metal, or will it harm cloth or cured leather. It dries and becomes ineffective in but a single round when exposed to open air, so it cannot be used as a blade venom. Belpren is neutralized by lamp oil. Belpren is effecting on all creatures     

Flumph acid toxin: An acidic toxin that does 1d8 damage, then 1d4damage per  round for 2 - 8 (2d4) rounds 

Giant ant poison: This acid does 1-3(1d3) to 20- 60(20d3) damage, save for half damage 

Hangman's acid: Does  3-12 (3d4) damage, lasts  for 2-4 (1d4, treating all 1's as 2's). This acid will wash off with water, but if alcohol is applied to it, it does DOUBLE DAMAGE

Sheet ghoul acid: Does 2 - 7 (1d6+1) damage (No save)

Standard Acid: [S8] This corrosive liquid created by alchemists will do 2-12   
points of damage to any living creature and do minor damage (save vs. acid) to  
any non-organic substance except glass or ceramic items. It may only be        
contained in glass or ceramic vials. XP value: 20 gp value: 100

Thessalhydra acid: Causes 1-20 (1d20) damage, 1 point per round

Ustilagor acid: Causes 2-5 (1d4) damage per round for 2 rounds

White hydra: This is an acid which freezes upon contact with the air, it  does 6- 36(6d6) damage