The use of non-aqueous deacidification procedures as a preventive conservation measure to assist in retarding the deterioration
of painting canvases has been suggested by the Conservation Department of the Tate Gallery . The reverse sides of paintings
are treated with commercially available MMC solution (methoxy magnesium methyl carbonate). The aim of this paper is to describe
how dynamic mechanical thermal analysis can be used to evaluate the effects of this treatment. Measurements are described
on modern commercially primed canvas samples  which show that the MMC treatment does cause an increase in the modulus or
stiffness of the primed canvas materials but that the effect on theTg is minimal. The response of the treated materials to variations in relative humidity has also been studied and indications
are that the response of treated canvases to variations in relative humidity differs from those of the untreated canvases.