semi-covert definition
semi-covert means not directly perceptible by the human senses but detectable by those senses through the use of external devices, such as a UV torch or a special pen or marker, which do not require expert knowledge or specialist training. The ‘covert’ category of authentication solutions authenticated with off-the-shelf tools referred to in ISO 12931:2012 shall be presumed to meet this definition;
semi-covert means not directly perceptible by the human senses but detectable by those senses through the use of external devices (such as a UV torch);