The influence of frother on the coalescence dynamic of bubbles coated with particles was investigated. Two bubbles grown at the tips of adjacent capillaries were loaded with methylated glass particles and pushed against each other to provoke coalescence. The event was recorded by a high speed camera and the change in the bubble shape at the moment of coalescence was analysed using an image analyser. Trends in oscillation behaviour and particle detachment in the absence and presence of frother were presented. (C) 2010 Elsevier Ltd. All rights reserved.