Internally, small amounts of moisture are absorbed through porous finishes, including limewash or distemper (an old form of paint made from whiting and glue) over lime plaster.
Yn fewnol, caiff ychydig bach o leithder ei amsugno drwy orffeniadau mandyllog, gan gynnwys gwyngalch neu ddistemper (hen fath o baent a wnaed o sialc a glud) dros blastr calch.