Vinegar
acetic acid
Ant’s bite
formic acid
Citrus fruits (orange, lemon)
citric acid
apple
malic acid
curd
lactic acid
spinach
oxalic acid
proteins
amino acid
stomach
hydrochloric acid
tea
tannic acid
amla (vitamin-c)
ascorbic acid
tamarind, grapes,unripe mango
tartaric acid
labortary
Phosphoric acid
labortary
nitric acid
labortary
sulphuric acid (STRONGEST)
labortary
hydrochloric acid