Sir ji mai ek laundry me gya tha waha white kapdon se stain nikal rahe the oxalic acid se pahle stain me oxalic acid daalte the phir usme white color ka powder daalte the dono ke reaction se red bubble nikalte the phir stain gayab ho jata tha maine puchha ye kaunsa powder hai toh unhone bataya nahin sir kya oxalic acid me soda ass milane se reaction me color red ho jata hai bataiye sir ji please
Sir ji mai ek laundry me gya tha waha white kapdon se stain nikal rahe the oxalic acid se pahle stain me oxalic acid daalte the phir usme white color ka powder daalte the dono ke reaction se red bubble nikalte the phir stain gayab ho jata tha maine puchha ye kaunsa powder hai toh unhone bataya nahin sir kya oxalic acid me soda ass milane se reaction me color red ho jata hai bataiye sir ji please