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Old 11-09-2006, 12:23 PM
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Meisie Meisie is offline
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Re: Casein: How to make emulsion & paint

I was wondering if casein paint will stay wet for use over several days on a palette, such as a stay-wet type? or sealed with wrap over the palette? kept in the fridge so it doesn't turn into a science experiment
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Old 11-09-2006, 05:36 PM
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Re: Casein: How to make emulsion & paint

I don't think a sta-wet tray is really necessary for casein, as it stays workable as is for quite a while. I'll admit I've never tried it, as I've never felt compelled to. Typically, I only squeeze out what I think I'll need, and don't bother saving leftovers.
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Old 11-10-2006, 11:51 AM
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Re: Casein: How to make emulsion & paint

Thanks Dave...I'll just have to learn what those amounts to squeeze out will be....and that only my own experience could tell me
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Old 11-23-2006, 03:42 PM
gerdbrunzema gerdbrunzema is offline
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Re: Casein: How to make emulsion & paint

Dear Meisie ,

if you use low-fat curd,I can´t see a problem (the grease in natural curd, that is non low-fat, won´t dry and stay greasy so to speak). I use it and had no problems yet.


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Last edited by gerdbrunzema : 11-23-2006 at 03:45 PM.
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Old 11-23-2006, 03:55 PM
gerdbrunzema gerdbrunzema is offline
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Re: Casein: How to make emulsion & paint

Quote:
Originally Posted by dbclemons
Well... TECHNICALLY ( ) it IS an emulsion. An emulsion is anything mixed with something else in liquid form. In this case we've got casein, borax, and water. You actually had casein even before you started, since casein is the protein that's in the curd, so you just removed everything else. ...But, let's not quibble. What you've got there sounds like a good home-grown recipe. Thanks for sharing.

Well. Casein in itself is a solid matter (powder, usually) Borax as well. If you put that into water under the right conditions, the borax dissolves and that solution reacts chemically with the casein.
An emulsion (that´s how I learnt it, at least...) is a stable balance of at least two liquid matters of which one is not soluble in the other (like water and oil for example)
So when you add linseedoil to the caseine, it is an emulsion.

The curd is of course not fat-free. So here is a point. But you´re right, let's not quibble.


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Old 01-24-2007, 10:14 AM
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Re: Casein: How to make emulsion & paint

UPDATE:
I thought I'd post an update to this thread in regards to shelf-life. I saved a small amount of the emulsion (borax and glue) I mixed up for this demo. Typically, I make up a batch, use as much as I need, and flush the remainder, but this time I just wanted to see how long it would keep. The left-over has been in the refrigerator for about 4 months now, and by all appearances seems as usable as the day it was made. It has no odor or signs of spoilage. I stirred it up a bit, mixed a little pigment with it, and it behaves just as I'd expect a fresh batch to perform. Very encouraging.
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Old 01-24-2007, 11:17 AM
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Re: Casein: How to make emulsion & paint

Sounds good David!
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Old 05-02-2007, 04:25 PM
Jeanne-M Turner Jeanne-M Turner is offline
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Re: Casein: How to make emulsion & paint

I love the use of casein paint. It handles just the same way as Gouache or water colour and flows with the ability to create fine detail or impasto as one wishes. I use this paint as an ideal under painting to the use of W/S oil paint and this gives me the solidity and base more quickly to the oil paint. My problem is that I have a tin of emulsion from Shiva but have no idea what or how to use this. So far, water has been all that I need to create a painting.
I read that the emulsion can be mixed with dry pigment to add colours to the range of Shiva tubes but can one use this with gouache or watercolour paint to turn these into casein paint also? What else can this emulsion be used for? and why have it?
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Old 05-02-2007, 08:24 PM
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Re: Casein: How to make emulsion & paint

This is what Richeson/Shiva writes in their documents:
"Casein Emulsion is the pure casein binder that is used to make casein paints. As such, it can be mixed with casein paints to improve the brushability or flow without altering any other characteristics. When using casein paints for very thin washes, mix one part Casein Emulsion with five parts water to ensure color brilliance and to maintain adhesion and integrity of the paint film."

Essentially, it's recommended use is the same as when adding any other medium to paint (oil, acrylic, etc.) Yes, you can mix it with gouache or watercolor. The emulsion I make can also be used with oil to make a water mixable emulsion, so I assume the Shiva will work that way also.
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Old 05-03-2007, 03:54 AM
Jeanne-M Turner Jeanne-M Turner is offline
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Re: Casein: How to make emulsion & paint

Thankyou very much for your quick response. I do have a cadmium red pale tube of paint from Shiva sent with my other tubes from Dick Blick and this seems to be like tough jelly and does not dilute the same as the other colours. Is this because it is old and has not been stored properly or is this the normal consistency? My only objection to this paint is the strong smell of Shiva tubes. I find it pretty revolting and have no problem with the plaka casein paint in the same way but the shiva colours are better and more translucent.
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Old 05-03-2007, 09:52 AM
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Re: Casein: How to make emulsion & paint

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Originally Posted by Jeanne-M Turner
... I do have a cadmium red pale ... and this seems to be like tough jelly and does not dilute the same as the other colours ...

No, it's not normal for casein paint to be that way, but sometimes their tubes are either too dry or too wet. I've a tube of their Cad. Red Deep that is very liquid.

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Originally Posted by Jeanne-M Turner
...My only objection to this paint is the strong smell of Shiva tubes...

Yes, that odor bothers me too, even more than using turpentine with oils. Use proper ventilation when painting with these Shiva paints.
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Old 05-28-2007, 12:50 PM
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Re: Casein: How to make emulsion & paint

Thank you Dave for this wonderful, very informative thread.
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Old 05-28-2007, 01:24 PM
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Re: Casein: How to make emulsion & paint

Quote:
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I wonder clove oil will help keep critters away without causing problems? Someone - I don't remember the name- here on WC mentioned using it in Egg Tempera for preserving purposes, and keeping critters away.

Meisie

I posted some time ago that I use it in my egg tempera. In over five years, I've had no critter problems, and I don't varnish or frame behind glass.
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Old 06-04-2007, 10:36 PM
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Re: Casein: How to make emulsion & paint

BTW, I've rated this thread. If others are interested in rating it, perhaps we could make a sticky. Well worth it, I think.
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Old 06-05-2007, 03:31 AM
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Re: Casein: How to make emulsion & paint

Quote:
Originally Posted by AriadneArts
BTW, I've rated this thread. If others are interested in rating it, perhaps we could make a sticky. Well worth it, I think.
*cough* Eileen, it already is a sticky
This thread is part of this Sticky (see third entry):
Casein: Informative threads


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