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In medieval and Renaissance times, gesso (usually made of plaster of paris mixed with glue) was applied to wood panels, plaster, stone, or canvas to provide the ground for tempera and oil painting. Plaster of paris is prepared by heating calcium sulfate dihydrate, or gypsum, to 120–180 °C (248–356 °F).
- Gypsum Plaster
Gypsum plaster, white cementing material made by partial or...
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Fibreglass wool, an excellent sound and thermal insulator,...
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Feb 18, 2024 · Plaster of Paris has its origins in the Paris Basin, where large deposits of gypsum were found. The production of plaster of Paris involves a process called calcination, where the gypsum is heated to remove the water content and create calcium sulfate hemihydrate.
- Materials Needed
- The Experiment Begins!
- Why Use These Materials?
- Methodology
- The Recipes and Results!
- Mixture 1
- Mixture 2
- Mixture 3
- Mixture 4
- Mixture 5
If your local stores don’t carry everything, here are some Amazon Affiliate links! (And yes, I get kickbacks from Amazon if you buy through these links, but it won’t cost you anything extra.) 1. Cold water: free-ish. 2. DAP Plaster of Paris: I use the 4lb red box for $6.78 3. Acrylic paint(any cheap craft paint will do): 2oz for $0.99 4. Elmer’s Ca...
For this experiment, I am using the kittenloaf mold. It takes roughly two tablespoons (or 30ml) of plaster mix, which matches up well with the resin casting cups I got from the Alumilite™ Amazing Casting Resin. Besides, who doesn’t need more plaster cats in their life? Time to take a look at our ingredients and what role they play in the mix.
Acrylic Paint
The paint is included to make sure the wood glue is mixed well into the plaster and water. Thus I will be focusing on which colors work best. Adding too much paint can cause issues, so only use a drop! As you can see in the photo, most colors will only barely tint the end result, but it helps to pick a color that you want to paint it.
Plaster of Paris
I’m trying to keep the amount of plaster relatively consistent in this experiment and focus on the ratio of water to glue. My current method is to slowly add plaster of paristo the water until it just mounds above the surface. It is a roughly two to one ratio with the amount of water.
Cold Water
Since the amount of water determines how much plaster to use, I will be holding steady at 1 tablespoon (15ml) and adjusting the amount of wood glue. You always want to use cold water since hot water will cause the plaster to set faster.
Wait for at least 24 hours before using a newly made 100% silicone caulk mold. Otherwise the out-gassing will make bubbles in the casts. (It’s better to wait a week, or soak the mold in a bucket of...Use cold water only. Warm water will cause the plaster to set faster.Always add plaster to the water, neverwater to the plaster.Let the plaster set for 1-2 minutes before mixing so it has a chance to settle and unclump. (I mix the glue and paint while I’m waiting.)I started out using the measurements on the ‘spoon’ side, but swapped halfway through to using the measurements on the ML side. Sorry for the ensuing confusion! 1. A teaspoon (TSP) is 1/3 of a tablespoon (TBS) and 5ml-ish. 2. A dessert spoon (DSSP) is 2/3 of a tablespoon and 10ml-ish. 3. A tablespoon (TBS) is 15ml-ish. 4. 1 fluid ounce (OZ) = 2 tab...
1 DDSP
Nice color tint when mixed with the glue, but it fades a lot when mixed in with the plaster. However when it dries out it’s very close to white, so it would be great for a white or light colored paint job. Some of the other colors I tried below… not so much. This is about the feel of the mixture when I do it by eye instead of measuring, so I’m going to use this as my default. It’s solid, but a little too easy to sand. Still it’s not bad if you’re looking to make things a little more solid, bu...
1 DDSP
This was a very light color and didn’t tint well, even when just mixed with the glue. Once the plaster was introduced into the mix it was almost impossible to see. So ‘no’ for the paint color– I ended up trying the ratio again since it did so poorly. The resulting cast was pretty good, not too soft and there was only a slight glue layer on the back (probably because of the mixing fail). It sands well and seems relatively solid, however there were a few more bubbles in this one than there were...
2 TBS water, 3ish TBS plaster, 1 TBS wood glue, 1 drop Apple Barrel 21471 Spiced Carrot
I forgot to take a pic before I did the skim coat, but it looked almost identical to Mixture 2, 4 and 7 only more orange. Now this is a color that has some punch! Very easy to tell how well everything was mixing, makes me rather inclined to test more ‘warm’ colors going forward. I do, however, need to use a lot less of it or only use it on things where an orange tint to the final color is a bonus. There was a very minor glue layer to the back and it seems quite solid. It does still sand, but...
10ml Water, 20ml Plaster, 5ml wood glue, 1 drop Apple Barrel 20591 Bright Magenta
This is a repeat of the recipe I tried before just to see what the color does. Also I needed a good small batch test since the Sailing Sky didn’t mix as well as was hoped. Nice solid cast, not too many air bubbles this time. Pretty good mix! The pink looked like it was going to hold up well when I mixed it with the glue, but as soon as it hit the plaster it paled a LOT. But overall it had a nice tint to it and I was able to make sure the glue mixed well, which is the overall point.
15ml Water, 30ml Plaster, 10ml wood glue, 1 drop Apple Barrell 21484 Admiral Blue
This one I haven’t tried before, but I was pretty sure would be too heavy on the glue end of things… and I was right. So right. All of the back of the casts collapsed in on themselves in these odd ripple pattern. I’m assuming it’s because the glue shrank when it dried and there wasn’t enough resistance from the casting mixture to keep it from ripping apart. I had to repour the backs on some of the casts just to make them solid enough to come out of the molds. The cast did not want to demold,...
Gypsum plaster (plaster of Paris) Gypsum plaster, also known as plaster of Paris, is a white powder consisting of calcium sulfate hemihydrate. The natural form of the compound is the mineral bassanite. Etymology. The name "plaster of Paris" was given because it was originally made by heating gypsum from a large deposit at Montmartre, a hill in ...
Oct 16, 2013 · 1. History. The name Plaster of Paris (POP) had its origins from the fact that it was extensively mined from Montmartre in Paris district. But its use predates the industrial revolution, they have been found on the insides of pyramids.
- Hemant Sharma, Dhanasekara Prabu
- 2013
Plaster (by the late nineteenth-century, especially in the context of domestic and devotional objects, also called chalk or chalkware) lent itself to a higher degree of detail and specificity than wax, to greater precision in surface effects and texture, and also provided a surface well suited to paint, and thus to polychromatic images and objects (note faux wood-graining on plaster chair back ...
In the 14th century, Giotto, the notable Italian painter, used a finishing gesso of parchment glue and slaked plaster of paris. In medieval tempera painting, background areas intended for gilding were built up into low relief with gesso duro (hard gesso), a less absorbent composition also used for frame moldings, with patterns often pressed ...
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