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''' Egg ''' | ''' Egg ''' | ||
The first time we tested egg paint we followed the recipe exactly and were unhappy with the results. The pigment was slaked in water and then used in the recipe which calls for linseed oil, water, pigment and egg yolk. The pigment just | The first time we tested egg paint we followed the recipe exactly and were unhappy with the results. The pigment was slaked in water and then used in the recipe which calls for linseed oil, water, pigment and egg yolk. The pigment just seamed to stick together, like little bubbles of pigment suspended in the mixture. This is not an unexpected result if you think about it because oil is hydrophobic (or afraid of water) so it will not mix with water. That is unless you have an emulsifier, like soap, which can react with both oil and water-bridging the chemical gap. However, egg yolk is an emulsifier. What we hadn't realized is that the ratio of the oil to water to egg yolk had to be just right. What we were seeing '''was''' a water-in-oil emulsion that was only partially complete. There was too much water in the paint. | ||
The second time we tried to make egg paint we used unslaked (powdered) pigment. By not adding the extra water used to slake the pigment we achieved the correct oil to water to egg yolk ratio. The pigment mixed well into the paint. | The second time we tried to make egg paint we used unslaked (powdered) pigment. By not adding the extra water used to slake the pigment we achieved the correct oil to water to egg yolk ratio. The pigment mixed well into the paint. |