When handling cased photographs such as daguerreotypes, albumen prints, and tintypes, especially ones that have been hand-coloured, caution is required. They are fragile and even minimal efforts to clean them can irreparably damage the image. Hand-coloured cased photographs should be stored horizontally, in a single layer, preferably faced down. Cases can be wrapped with alkaline or buffered tissue paper. If the photograph has become separated from its case, a mat and backing board can be cut from alkaline buffered museum board. The mat is placed between the image and a newly cut glass plate while the backing board supports the image from behind. This "sandwich" is then sealed with Filmoplast tape. Commercial glass cleaners should not be used on new glass plates. Loose hand-coloured tintypes can be placed between mat boards. If bent, no attempt should be made to straighten them as this could cause the emulsion to crack and/or lift.