Technological expertise is a powerful auxiliary mechanism on the way of moving to the civilized methods of the art market activity. The research records in compliance with the international standards raise the liquidity of the objects of art. Any object of art even being signed by the most imposing name will be taken as having no knowing when it was produced or possibly fabricated without expert opinions that are convincing for the art market. The documents recording the objective findings can be used in legal practice and business activities. It is also the basis for receiving the evaluation certificate, a document that records the value of an art object and confers it with the properties of a legitimate object of trade, credit financing, collateralized property and insurance, etc The conclusions of the expert technologists are not of the attributive nature, i.e. they do not determine the affiliation of an expertized picture to a particular master and show that the resulting objective technological data either does not contradict modern conception about the specific technological features of the given time, or, quite the opposite, contradicts them.