This is my first attempt to turn a large cherry natural edge bowl. I have the outside of the bowl turned and when sanding the bark area of the bowl the dark bark dust is bleeding onto the lighter sap wood. This is leaving a smeared mess on a pretty large part of the bowl. I know it will even be a worse problem when I get to the inside. I just left it on the lathe and put a plastic bag over it. Maybe I should have put it into LDD :^() I need to know what I have to do to solve this problem.
Are you planning to turn this to completion while green or are you going to rough turn it and then finish turn it after it's dry?
Remove the plastic bag and put a tight weave cloth or a paper bag on it instead. The plastic attracts moisture to it and doesn't let it escape slowly. You don't want waterspots on your bowl where the plastic touches it. Yes, I know the bowl is wet already but it's fairly uniform at this point.
I am a little confused about your intent, green turning. How thin have you turned the piece? When I turn something green that I am going to sand I do the following (note: I only do this for natural edge bowls due to warpage, symmetrical bowls I do not finish this way):
Turn the piece to final dimension, in most cases 1/8" to 3/16", no more. 2. Once completely turned, in and out, but still held by the chuck I place my 100 watt light within the insides of the bowl as best I can them turn the lathe on very slow. I then go and have lunch or take a break for about 45 minutes to an hour. 3. Normally, when I return to work on the piece the surface of the bowl is dry enough to sand, not completely dry, but dry enough to sand. 4. I sand the piece to 320 grit, seal it with deft brush-on lacquer and put away to finish drying. 5. Once completely dry I turn the foot of the bowl, sand, and apply my final finish.
If you intend to wet turn and complete a symmetrical bowl that is risky as wood is going to move and you will probably not like the result. With natural edge bowls not only is it difficult to notice warpage but sometimes this adds interest to the piece.
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