Sketching on Canvas - Democratic Underground

NashVegas

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Sat Oct-29-05 01:36 PM
Original message

Sketching on Canvas

Is there any reason not to pencil sketch directly on a canvas to be used for an oil painting? A curious mind wants to know.

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Heidi

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Mon Oct-31-05 05:08 AM
Response to Original message

1. Yes, there's a good reason.

Over time, lead and graphite can migrate up through layers of oil paint to the surface of your painting. It's "safer" to sketch on canvas with chalk or charcoal, which will mix with the oil paint.

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NashVegas

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Mon Oct-31-05 10:12 AM
Response to Reply #1

2. Oops

Too late. Thanks for the explanation, though.

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Heidi

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Mon Oct-31-05 12:16 PM
Response to Reply #2

3. I'm sorry I didn't see and reply to your post sooner.

Edited on Mon Oct-31-05 12:17 PM by Heidi

However, it might be OK, if you isolated the graphite or lead with acrylic paint or a medium (like Liquin or something of that nature) before you began painting in oils. (I learned the hard way, too. Nothing worse than finishing a portrait, waiting six months to a year to varnish it, then having the original and imperfect sketch rising to the top.)

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NashVegas

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Mon Oct-31-05 03:44 PM
Response to Reply #3

4. I'm Not Sure

Edited on Mon Oct-31-05 03:44 PM by Crisco

The layer on top of the sketch was done w/a Galkyd medium, about 40% of the mix. I haven't done anything else to it yet.

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