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10day

Method

Prior to fingerprint deposition the brass samples were first ultrasonically cleaned in micro 90 solution for 15 minutes.

Following this the samples were then cleaned ultrasonically in acetone for 5 minutes, rinsed in distilled water,  then sonicated in iso-proponal, rinsed again, sonicated in ethanol, and rinsed for a last time, before being dried in nitrogen.

Finger prints were deposited by pressing onto the metal surface for 1-2 seconds. The samples were then left in air at room temperature for a set amount number of hours to corrode.

After the designated hours were up, the particular sample was washed using the method previously used by bond et al. in 0.5 L of warm water containing 3-4 drops of commercial detergent.

The samples were then placed in an XPS machine.

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