100M Resistor 4th B. white.

[Vtile]

I have this 100Megaohm resistor, deep purple to brownish body. It is 100 megs since it divides 10V to 5V series with my 100Meg Multitester and so says also the colorcode: brown-black-purple-white

Now what is the White??? I have no source/reference that it even should exist in that place as a 4th band.  I'm just curious.. Anyone have any information what is this presumaply nonstandard marking.

I have no idea of the age of this as it is salvaged part from random electronics in the past (late 90s when it did end to my box of resistors).

[mikeselectricstuff]

For very high values, which will often be used at high voltages, you don't want a metallic ink like gold or silver, so white is probably used as non-shiny silver.
These VR68 high-voltage resistors use yellow instead of gold


From the datasheet http://www.vishay.com/docs/28907/vr25vr37vr68.pdf

Yellow and gray are used instead of gold and silver because metal  particles  in  the  lacquer  could  affect  high-voltage properties.

[Vtile]

Oh, really nice. Thx.

It might indeed be the explanation, since it does have good technical reasoning.

The resistor I have also do have this hard enamel shine on it so it might indeed be a highvoltage range. Something over the typical jellybean dip to paint range anyway.