The Zorn Limited Palette & more – Ep.6 Oil Painting Q&A with Mark Carder

If you have a question for me, post it in the comments below. I'll answer as many as I can on next Thursday's episode. Here are links to each question answered in this video:
00:16 — a lesson and demonstration of the Zorn limited palette and the Geneva palette
13:40 — How do you get out of a painting slump?
15:38 — Do you build your own paintbrush holder?
17:10 — Could you do a varnish demonstration?
17:33 — How can you fix a burnt umber that tends towards grey? Can you fix it with burnt sienna?
18:21 — What kind of light bulbs do you use while painting? And why does the color temperature matter?
20:43 — How long before we can buy a color checker from you?
21:05 — In your "How to Mix Colors" video you talked about good step versus bad step? Could you elaborate on what you mean by this?
22:36 — What is dangerous about paint fumes, and how do ventilate in the middle of winter or summer when you can't open a window?
23:34 — I'm having trouble painting fabric. Could you please help?
25:07 — I enjoy painting thickly with painting knives. Can I use thickening agents like cold wax medium with Geneva paints?
25:33 — Can you explain what you meant by "leveling paint" in your recent video "The Benefits of a Limited Palette"?