In this article, we demonstrate a technique to visualise the stabilising particles at the gas-solid interface of metal foams by employing metallographic etching. This technique is easy to perform and can be applied on a relatively large sample size. The particles present at the gas-solid interface of five different types of foams were investigated. Information on the type of particles and the particle coverage could be obtained from this study. © 2020 Elsevier B.V.