It is distinguished from other types of leather by a processing step that takes place after tanning, where birch oil is worked into the rear face of the leather.
Below is an instruction that describes a task, paired with an input that provides further context. Write a response that appropriately completes the request. ### Instruction: List the MITRE techniques contained in the text. ### Input: It is distinguished from other types of leather by a processing step that takes place after tanning, where birch oil is worked into the rear face of the leather. ### Response: .