justin_o_guy2 wrote on 01/03/12 at 22:42:02:A charged cap will hold its charge quite a while. In the old picture tube type televisions, thers a place on the tu8be called the aquadag. If it been unplugged for months, it may still knock you off your feet.
NOTE* Aquadag sounds like it relates to water.. if you want to see if theres any water involved, touch it.. & see if you dont find some "water"..
Straight off Wiki.
"Aquadag is a trade name for a graphite based coating commonly found in cathode ray tubes. It is manufactured by Acheson Industries, a subsidiary of ICI. The name is a shortened form of "Aqueous Deflocculated Acheson Graphite". Other related products include Oildag, Electrodag and Molydag. The product names are often printed with DAG in upper case (e.g. AquaDAG)."
"Aquadag is a water based colloidal graphite suspension, and may be painted on to items to avoid build up of static, or provide electrical screening.
Aside from its use in the production of CRTs, Aquadag is used in many types of high voltage lab apparatus where the creation of a highly predictable electrostatic field is required. The surfaces of some metals (most notably aluminum) can develop nonconductive oxide layers which tend to disrupt the electrostatic field produced around the surface of the metal when used as an electrode. Aquadag is not subject to such effects, and provides a completely uniform equipotential surface for electrostatics."
There isnt a "place" called the Aquadag on a tube in a CRT. Its simply the coating in and on to tubes to screen stray electrical fields and prevent arcing.