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This paper reports the results of measurements of the "visual thickness," obtained from flow visualization experiments by the schlieren method, of initially plane interfaces between two gases under impulsive accelerations. It is found that when such interfaces are processed by just one incident shock wave of strength of order M,= 1.5, their thickness increases slowly and they require observation over extended times; their growth rates are found to slow down with time, in agreement with simpledoi:10.1063/1.858637 fatcat:n6uanmax4nhahjpz4c5o5gvbae