NIK Cocaine Identification Swabs, (pack of 50). Used to presumptively detect the presence of Cocaine, simply wipe a Cocaine ID Swab over the suspected surface. Test results are immediate. If the swab changes to a blue color, there is a good reason to suspect the presence of Cocaine and may be sufficient cause for further investigation. Each swab is sensitive to trace amounts of residue; far less than could be collected for regular field testing. Each 1" x 11⁄2" swab is hermetically sealed in single-use foil envelopes, ideal for carrying in a pocket or storing in a kit. Unlimited shelf life assures that these swabs will provide accurate, reliable results when and where you need them.