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The cheapest and effective white light solar filter I've found is the Baader Solar Film.
Available in large sheets which can be easily cut to make a full aperture filter for the 12".
Very safe and effective, if correctly placed on the tube. Remember to also cover the finder!!
With open tube scopes you'd also be safer draping a light plastic tarp over the tube to prevent stray sunlight from burning anything while setting up and aligning.
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