law: Sale of Goods Act, 1930
  22. Specific goods in a deliverable state, when the seller
  
  has to do anything thereto in order to ascertain price
  Where there is a contract for the sale of specific goods in a
  
  deliverable state, but the seller is bound to weigh, measure, test or do some
  
  other act or thing with reference to the goods for the purpose of ascertaining
  
  the price, the property does not pass until such act or thing is done and the
  
  buyer has notice thereof.