The $3.4 billion proposed takeover of Ciba Specialty Chemicals by the German-based chemicals giant BASF announced in mid-September is likely to be followed by similar merger deals covering the supply chain of inks and other graphics materials.     The acquisition is seen as a sign of intense financial pressures on suppliers of raw materials and intermediates from soaring raw material costs, triggered by increases in the prices for crude oil and other basic commodities.     P...