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Forum: The Forum for Tempera Painting Issues 05-08-17, 06:14 PM
Replies: 7
Views: 560
Posted By Georgeoh
It is difficult to provide such information...

It is difficult to provide such information because it is entirely dependent upon how thickly each coating is applied and the type of support to which it is applied. Based upon our own testing we had...
Forum: The Forum for Tempera Painting Issues 03-08-17, 08:42 PM
Replies: 13
Views: 806
Posted By Georgeoh
Whether an initial egg wash contributes to fatty...

Whether an initial egg wash contributes to fatty acid migration and resulting issues (i.e., haze or efflorescence) would depend on factors such as the absorbency of the ground and total amount of egg...
Forum: The Forum for Tempera Painting Issues 03-08-17, 06:09 PM
Replies: 13
Views: 806
Posted By Georgeoh
The reason I believe the fat-over-lean principle...

The reason I believe the fat-over-lean principle does not apply to egg tempera is because egg yolk does not envelop pigment particles as does oil in oil paint films, and this is critical to the...
Forum: The Forum for Tempera Painting Issues 03-08-17, 04:42 PM
Replies: 13
Views: 806
Posted By Georgeoh
Paint is an adhesive and good adhesion is not...

Paint is an adhesive and good adhesion is not based on mechanical adhesion of porous substrates. In fact adhesion of paint layers is based on dispersive adhesion, which is due to the forces of...
Forum: The Forum for Tempera Painting Issues 02-08-17, 05:18 PM
Replies: 13
Views: 806
Posted By Georgeoh
Good points, Koo. The cracking you mentioned...

Good points, Koo.

The cracking you mentioned in your reply (Item 3), I believe should be attributed to the binder-to-pigment ratio rather than to a fat-over-lean principle in egg tempera. Although...
Forum: The Forum for Tempera Painting Issues 02-09-13, 09:12 AM
Replies: 23
Views: 27,089
Posted By Georgeoh
We are currently investigating adhesion of...

We are currently investigating adhesion of collagen glue and chalk/gesso grounds on aluminum composite panels. These panels are typically coated with a polyethylene coating over a pretreated surface....
Forum: The Forum for Tempera Painting Issues 22-05-09, 05:28 AM
Replies: 21
Views: 18,917
Posted By Georgeoh
Exclamation Alessandra, Rublev Colours is not a Russian...

Alessandra, Rublev Colours is not a Russian company, but is a registered trademark of Natural Pigments, a California-based company. Most of the historical pigments in the line of Rublev Colours we...
Forum: The Forum for Tempera Painting Issues 22-05-09, 04:33 AM
Replies: 10
Views: 9,573
Posted By Georgeoh
First, I'd like to point out that as a company...

First, I'd like to point out that as a company Natural Pigments believes that there is no such thing as a non-toxic substance. All substances in certain circumstances or in certain amounts are toxic...
Forum: The Forum for Tempera Painting Issues 29-11-06, 02:53 AM
Replies: 37
Views: 36,825
Posted By Georgeoh
At Natural Pigments, we grind and levigate (it is...

At Natural Pigments, we grind and levigate (it is not slaking) pigments to different particle sizes, depending on the desired color and pigment properties. So the answer is highly variable. For...
Forum: The Forum for Tempera Painting Issues 29-11-06, 02:43 AM
Replies: 37
Views: 36,825
Posted By Georgeoh
There is no "proper sequence," it depends on the...

There is no "proper sequence," it depends on the effect that you are seeking to achieve. A layer of coarse particles over fine particles, allows more light to pass through the top layer onto the...
Forum: The Forum for Tempera Painting Issues 10-11-06, 08:20 PM
Replies: 5
Views: 5,694
Posted By Georgeoh
Cherry tree gum dissolves in water, but requires...

Cherry tree gum dissolves in water, but requires less time to dissolve if the water is heated in a double-boiler. Do not boil the gum in the water.

There is no need to add other ingredients....
Forum: The Forum for Tempera Painting Issues 07-11-06, 06:20 PM
Replies: 5
Views: 5,694
Posted By Georgeoh
I have harvested cherry and almond tree gums and...

I have harvested cherry and almond tree gums and made tempera and an emulsion paint after reading about their use in the Strasburg MSS. I found the cherry gum forms a clearer, more brilliant color...
Forum: The Forum for Tempera Painting Issues 07-11-06, 06:16 PM
Replies: 6
Views: 5,997
Posted By Georgeoh
Orpiment

Richard, How did you not know that orpiment is toxic pigment? It is clearly indicated on the web site and on the jar labels. It can be used safely if precautions are taken in using it. It is a...
Forum: The Forum for Tempera Painting Issues 02-10-06, 05:12 PM
Replies: 63
Views: 50,593
Posted By Georgeoh
Re: Toxitity

This is what is typically reported in the MSDS for powders that is, inhaling dusts can cause irritation to the lungs. MSDS is intended for workers who may be exposed to large amounts of these...
Forum: The Forum for Tempera Painting Issues 01-10-06, 04:33 PM
Replies: 63
Views: 50,593
Posted By Georgeoh
It would be better to provide the actual...

It would be better to provide the actual citations or at least references to the documents that you read so that others can make their own independent conclusions. I am a member of the ASTM and I...
Forum: The Forum for Tempera Painting Issues 29-09-06, 04:40 PM
Replies: 63
Views: 50,593
Posted By Georgeoh
The information at this web site is not entirely...

The information at this web site is not entirely accurate and is based on secondary sources (making this a tertiary source of information). Usually the best information is usually contained on the...
Forum: The Forum for Tempera Painting Issues 29-09-06, 04:01 AM
Replies: 63
Views: 50,593
Posted By Georgeoh
The danger is ingesting these pigments as dry...

The danger is ingesting these pigments as dry powders through your lungs (as in breathing the dust) or through your eyes, mouth, ears or other orifices by transferring them on your hands. There is...
Forum: The Forum for Tempera Painting Issues 28-09-06, 08:47 PM
Replies: 63
Views: 50,593
Posted By Georgeoh
I have studied these issues extensively and have...

I have studied these issues extensively and have not found what Jeff claims, namely that pigments are absorbed through the skin. I am well aware of the toxicity of many pigments, especially those...
Forum: The Forum for Tempera Painting Issues 28-09-06, 05:35 PM
Replies: 63
Views: 50,593
Posted By Georgeoh
I would be interested in what literature states...

I would be interested in what literature states this to be so, because most inoganic pigments are insoluble and hence are not absorbed through the skin. Even if they are soluble, this does not...
Forum: The Forum for Tempera Painting Issues 17-06-06, 06:51 PM
Replies: 7
Views: 8,818
Posted By Georgeoh
Using a mortar and pestle

You can use a mortar and pestle to disperse pigment in water (or the paint vehicle of choice), but it is not as effective as a muller and slab. You can disperse more pigment faster with a muller then...
Forum: The Forum for Tempera Painting Issues 04-06-06, 07:02 PM
Replies: 7
Views: 8,818
Posted By Georgeoh
Re: Urgent, mulling problems!!

The advice to shake pigments in water is probably the most inaccurate and inept advice about dispersing pigment in water that I have read. Paint manufacturers use high-speed dispersion mixers and...
Forum: The Forum for Tempera Painting Issues 29-05-06, 05:52 PM
Replies: 16
Views: 16,516
Posted By Georgeoh
Clarifying this issue...

Jan,

My earlier posting was meant to give a terse answer to the topic. The Egg Tempera forum is certainly not the place for such a discussion, so I do not wish to continue this topic in this...
Forum: The Forum for Tempera Painting Issues 29-05-06, 07:30 AM
Replies: 16
Views: 16,516
Posted By Georgeoh
Please read my words carefully, because I...

Please read my words carefully, because I mentioned that among some icon painters it is affectation. As for the individual who is "snarky" about iconographers, it is to this person's own discredit as...
Forum: The Forum for Tempera Painting Issues 29-05-06, 12:41 AM
Replies: 37
Views: 36,825
Posted By Georgeoh
Re: collecting native minerals

I probably have more experience with "found" pigments than most artists. My company, Natural Pigments, has been extracting many different pigments from the far corners of the earth. Most of our...
Forum: The Forum for Tempera Painting Issues 29-05-06, 12:20 AM
Replies: 3
Views: 7,222
Posted By Georgeoh
Dispersing pigments

In dispersing dry pigment powders in a paint vehicle there are several steps that must be followed:

The wetting step consists of replacing the adsorbed materials on the surface of the pigments and...
Showing results 1 to 25 of 30

 
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