law: The Joint-stock Companies Act, 1857
  LX. Liability of present shareholders in respect of debts.-
  In the event of any Company being wound-up by the Court or voluntarily, the existing shareholders shall be liable to contribute to the assets of the Company to an amount sufficient to pay the debts and liabilities of the Company, and the costs, charges, and expenses of winding-up the same, with this qualification, that, if the Company is limited, no contribution shall be required from any shareholder exceeding the amount, if any, unpaid on the shares held by him.