The paint seems to have higher attenuation than the wood. Two old papers from 1971 raise concerns about the lead content of paints used on pencils, but I can't find any recent data on the contents of the paint.
References
- Pichirallo J. Lead poisoning: risks for pencil chewers? Science. 1971 Aug 6;173(3996):509-10.
- Tenenholz T, Baxter AB, McKhann GM. Orbital assault with a pencil: evaluating vascular injury. AJR Am J Roentgenol. 1999 Jul;173(1):144.
- Schaplowsky AF. Lead in paint on pencils. HSMHA Health Rep. 1971 Nov;86(11):961-2.
Hello! Please look at the information of the Australian Customs Service about restrictions on importing pencils with several heavy metals in the paint/lacquer (http://www.customs.gov.au/webdata/resources/files/FS_PencilPaintbrushes.pdf)! So there seems to be some factories in the world producing pencils with toxic ingredients!
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JC