Nice article Ron.
My question concerns your application of the oil paints for the filter. Before you added the dots of paint, did you apply a protective coat over the paint? And if so, was it a dull coat or gloss coat? The reason I ask is this, I have tried this technique on an unprotected base coat only to have the dots of paint stain the base coat.. Was I a bit perturbed at those results to say the least.
Dave