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Shorted winding should have blown that fuse. So there is probably an open winding. Try an Ohm Meter for diagonostics on the winding.

I would assume that if you did just one color they muddy situation would not occur. Since one of your colors is purple and becomes mixed with the other two some transparency would disappear. I would also suspect the degree of transparency would greater if there was a smaller quantity of the purple. ...

It is just a little better than etching cream, but for best results an air compressor is a big bonus. The can of propellent are handy but you can get better control with the compressor.

Be sure to use a partical mask when you use than.

Eventually you will probably want an upgrade.

It is a new one, but two attempts to download did not make it here.

Tim.... I teach summer classes as one of the educational activities of the Pennsylvania Chautauqua. Your experience with students is about identical to mine. Thye need to have some "show and tell" when they return home. I attempt to provide as much information asis possible within the time...