Fluorescent Marker for Detecting Gel or Lack of Gel

An electrode for selective attachment to the skin of a subject, the electrode comprising:

• a conductive member;
• a conductive composition disposed on a first side of the conductive member, wherein the conductive composition includes a photo-reactive quantity of a dye-marker;
• and
• an electrical lead in electrical communication with the conductive member, wherein the conductive composition has a transparent and colorless appearance under normal or ambient lighting and at least a dyed, translucent or fluorescent appearance under artificial lighting.

A method of manufacturing and/or inspecting an object including a quantity of a transparent and colorless conductive composition when viewed under normal or ambient lighting conditions, the method comprising the steps of:

• providing an object including a conductive composition having a photo-reactive quantity of a dye-marker;
• wherein the conductive composition has a transparent and colorless appearance under normal or ambient lighting and at least a dyed, translucent, or fluorescent appearance under artificial lighting;
• and
• exciting the object with an artificial light source to cause the photo-reactive quantity of the dye-marker to irradiate, whereby the conductive composition becomes at least one of colored, translucent and fluorescent.