Note J — Chapter VII
Edwin C. Middleton translation
Instead of wax the plate may be dusted over with powdered French chalk, all traces of which are removed before applying the collodion. After such treatment the film is scarcely likely to leave the plate before required. But as a further precaution, if the edges of two plates be drawn across each other a rough edge will be produced, to which the collodion coating will adhere tenaciously.—Trans.