effective powder of paint ,Senior soil,magnesium, calcium carbonate and so on .It is applied to prevent oil-paper. STANDARD ... , leather tanning agent, effective powder of paint ,Senior soil,magnesium, calcium carbonate and so on .It is applied to prevent oil-paper ... bag: 25kg. Stockpiled at the ventilated place, avoiding rain, moisture and insolation. Please handle with care to prevent the bag from ...