Posts Tagged ‘materials’

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Shiva Casein Paint Test Update

July 24, 2017

To follow up on my previous post, I had found that one of my Richeson/Shiva paints, Cadmium Green, transferred to a dry paper towel with just some light rubbing after the paint had dried. Now I wanted to see if other tubes I owned had this same problem. They do.

This picture shows a sheet of paper on which I painted 1 inch swatches of all the different tubes of Shiva paints I have. The paper towel at the bottom shows pigment from each swatch that transferred over. I did not dilute the paint at all with water, and did not apply the paint too thickly. All of the paints smeared easily when rubbed, some more than others, with the sole exception of the Raw Sienna. The ivory black in particular smeared very badly, and even after a day of drying felt to have a weak paint film.

Since all of the paints are old, in some cases decades old, I asked around to other people who used these paints if they could test any tubes they might have that are newer, and see if they had the same problem. I heard back from a couple people. One person had some Richeson caseins that were only months old, and found they had the exact same pigment transfer problem. The other artist rubbed the surface of paintings he had made that were at least 3 months old, and said no paint at all rubbed off. What this tells me is it might be possible that if the paint is allowed to cure for awhile longer, the pigment will adhere better and not rub off. This strikes me as a strong possibility. So, I think I’ll do a new test on paint swatches that sat undisturbed for a month or more, and then see if any pigment rubs off.

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Comparing My Casein Paint to Shiva Brand

July 22, 2017

I wanted to follow up on my previous post where I made my own casein white paint, and see how well it compares to tubes of the Shiva paint I had, and discovered something interesting. I used the paint swatch I made testing my paint on a sheet of Strathmore textured “Art Paper” 65lb.

I painted a small swatch of the Shiva titanium white, undiluted, next to the swatch of mine I had made. It may be hard to tell in this photo, but I noticed their white has a slight off-white yellowish tint to it that mine does not. I let this dry for a day, and came back and gave both a buffing with some colored fabric, and saw no transfer of pigment from either swatch. Next I placed a small piece of cellophane tape over each one, rubbed it, and removed the tape. Both transferred some paint, but more paint came off the Shiva swatch, lifting almost all the paint from the paper. The casein binder I used to make my paint was over a year old, so later I’ll see if a fresher batch performs better.

Since that tube of Shiva white is many years old, I thought I’d test a newer tube of Cadmium Green that I had to see if it performed any better. Rather surprisingly the pigment adhesion was worse. I let that paint swatch dry for about 3 hours, and rubbed the surface with a paper towel. You can see quite a bit of pigment rubbed off. The tape test pulled off quite a bit of pigment also, and the way the pigment transferred was not in sections of paint, but powdery like what I saw on the paper towel. This tells me that the adhesion on this tube of Shiva paint is poor. Granted, it’s about 5 years old or so, but it shouldn’t come off this easily. I have commercial tubes of gouache that adhere better than this. I hope the newer Richeson brand of Shiva adheres better. Now I want to test the rest of the Shiva paints I have. This is not terrible, but surprising. This paint adhesion is not much better than soft pastel.

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Making Casein Paint: Titanium White

July 21, 2017

I’ve been wanting to get back to using one of my favorite paint mediums for awhile, casein. I took an inventory of the tubes I had available for my next project, and noticed I was short or low on a few colors, particularly titanium white, so it’s time to make some more.

I have a bathroom next to my studio space that I use exclusively for this type of work, so I clean off an area by the sink, and set up my tools and supplies. I have a large sheet of textured glass that I use for mixing the paint. There’s a mortar and pestle for smoothing the dry pigment, an empty tube for the paint, a squirt bottle of distilled water, about 4 ounces of casein binder, and white pigment.

The pigment is a little lumpy, so I use the pestle to break it down some, and place about 2.5 tablespoons of pigment on the glass with about 2 teaspoons of binder and just enough water to get the consistency of paint I want, and spend a few minutes with the spatula smoothing it out.

I test the paint I’ve mixed to see if it spreads easily with a brush without having to add any water, and check the opacity on this sheet of colored paper. It looks fine, so I repeat these steps about 2 more times to make more paint to fill the tube.

There’s enough paint now to fill up this 50ml tube and another 22ml. I seal the ends by squeezing it shut at about 1/2 inch below the end. to give me enough room to crimp.

I fold over a little of the end, and crimp it tight with some pliers, and repeat this about 2 more times to get a tight seal.

Here I have two tubes of white casein labeled and ready to use.

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Sinopia Casein Gesso Update: Jar Problem

May 2, 2017

I’m interrupting my series of posts on the new painting to point out a problem I discovered today with a jar of Casein Gesso from Sinopia. This follows up on two posts I made in the past: one is a review of this product, and another was how I store paint containers like this upside down.

I bought this jar of gesso a little over a year ago, and keep it inside a drawer in my studio. I haven’t used it in awhile, but today I decided to open the drawer to try it out again, only to find the contents had leaked out. The lid was screwed on tight, but that wasn’t enough to stop air from getting in, and some of the contents leaking onto the drawer. Fortunately that was plastic, so it was easy to clean (that’s what that clean piece of gel is in the picture,) but I had to use a plumber’s wrench to get the lid off, and found that about 1/3 of the paint had dried out. That rounded disk inside the lid is about 1/2 inch layer of dried paint, and more dried on the sides of the jar. It had been stored upside-down.

As I mentioned in the article link above, I store containers like this upside down just for this reason. Screw-on lids of this type make very poor containers for paint, since air gets in easily. Even if this was stored upright, air gets in, and would have dried out the paint even worse. Some jars you can buy come with cushions inside the lid, sponges or thick paper, that help seal the jar. Another solution I’ve used in the past is to wrap wide tape around the outside. That has to be replaced frequently, but it’s better than throwing away paint.

Metal cans for paint make a better seal than a screw-on lid, unfortunately, a quart size can is the smallest available. Tubes are also better since the opening is smaller, so less air gets in. The best option is to use it up quickly. Prime several sheets of paper stock or canvas that you have on hand, and don’t store the left over paint for very long.

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Making Gouache Paint: Light Brown

September 23, 2016

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I’m making more gouache paint. This is a tube of “light brown” I mixed up last night. It’s made of mostly raw sienna, but has a pale grey cast to it. I like to use it for skin tones. Still have to make some cerulean blue, and a mid-tone grey.

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I like these empty tubes I get from Creative Mark (c/o Artarama.) No cap problems, or leaking from the tubes, and the caps have a little indentation at the top that works well for painting a color swatch to identify the paint inside. This tube is 22ml.

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Lip Balm Tube Holder for Oil Pastels

September 9, 2016

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Okay, here’s my latest experiment. I was online looking for some more gum arabic powder to make some gouache, and I found a new supplier to try out, Mountain Rose Herbs, who had a good price. While on their site, I saw they had various containers too, including empty lip balm tubes. (People make their own lip balm? Okay.)

As some of you who have been following my blog may know, I make my own oil pastels. Seeing these empty lip balm tubes you can probably see where my idea went, so I bought a few to try out as oil pastel holders. The order came in the mail yesterday.

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The first thing was to melt the block of charcoal pastel I had made into a liquid using a coffee cup warmer and a muffin tin. I thought I might want to make the pastel a bit harder, so I shaved off a bit of encaustic wax too. I found a piece of plastic from some packaging that made a better funnel by using a snipped off corner, and poured the wax into the tube.

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So, how well does it work? Not bad. It poured in fairly easy, but the wax hardens quickly, and this left some air gaps in the tube. I need to find a better tool to push it down and fill it with more wax. The tube is small (1/2 x 1″), but they’re cheap (.30 each) so I can make several at once. The cooled wax will easily push up, but not back down by turning the dial at the bottom. It does make a nice holder, and is not messy to use.

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Framing4Yourself Material Arrived

May 7, 2016

Well, that was quick. The order I made of cut frame pieces was delivered by FedEx today, just 2 days from Illinois to Texas by ground service. They were packed in a cardboard box (I was expecting a mailing tube) wrapped and stuffed in brown paper.

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I’ve just roughly dry fit the pieces together to see how it looks, and the edges are sharp and clean. I may want to go with a wider trim than these now that I see it better, but I’ll go ahead an glue it to get a better idea.

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Here it is in my strap clamp, and you can see that the corners fit very well. So far, I’m very pleased with Framing4Yourself, and would recommend them for custom framing material.