No wash shall be used, except such as has been prepared within the distillery, nor shall any wash be removed from the distillery :Provided that if so desired the licensee may be allowed to remove simples of wash from each vat in quantity not exceeding 2,250 litres per vat for use in the distillery laboratory:Provided further that in the case of the preparation of wash for the manufacture of malt whiskey the said wash may be prepared in the Brewery and then pumped into a distillery for purposes of distillation.
