As per section 2(43) free reserves means, 

means such reserves which, as per the latest audited balance sheet of a company, are available for distribution as dividend:

Provided that—

(i) any amount representing unrealised gains, notional gains or revaluation of assets, whether shown as a reserve or otherwise, or

(ii) any change in carrying amount of an asset or of a liability recognized in equity, including surplus in profit and loss account on measurement of the asset or the liability at fair value,

shall not be treated as free reserves