Tuesday, February 23, 2010

What is the difference in acrylic paint and oil paint.. i mean in time to dry, texture, and ingredients?

it's in the name of science :-p hehe.. but i can't find ingredients anywhere.. if you know, please help me out..What is the difference in acrylic paint and oil paint.. i mean in time to dry, texture, and ingredients?
The common ingredient in both paints is the pigment - they are basically identical- but what makes them different is the binder or vehicle.





The traditional binder in oil paint is linseed oil, which on its own (without any additives) can cause the paint to take between 2 to 6 days to become dry to the touch, up to months to cure depending on paint thickness, temperature, atmospheric humidity %26amp; ratio of oil. Oil paints dry by oxidation - oxygen must reach to the bottom paint layers in order to cure completely - so thick paint cures more slowly.





The binder in acrylic is a ';acrylic polymer emulsion'; - a mixture of acrylic polymers and water. Acrylics dry by evaporation, meaning the water must work its way out of the paint from the bottom up. As the water evaporates, the polymers form a matrix that binds the paint %26amp; pigment together. Depending on paint thickness, temperature, humidity and volume of water or retarder added, it can be mere minutes before the paint feels dry, and between a few days to a few weeks before it's fully cured.What is the difference in acrylic paint and oil paint.. i mean in time to dry, texture, and ingredients?
the main difference is that acrylic is pigment colours mixed with a water based medium that allows the pigment to dry quite fast,..this has its ups and downs,..if you want to blend acrylics you have to use it quite neat to keep any substance of the colour,..and the colours tend to be very bright,..wouldnt be my favorite to flesh tones,...but they are great if you use a mix of block colour as a base, allow to dry and then use a dry brush technique over,..ie,..removing the majority of paint from the brush so that u only lay down a shade,..almost like using chalk pastels,..then oils,..as the name suggests is a pigment suspended in an oil medium,..the drying times can be varied as can acrylics with various retardents and .....cant find he word,..basically an added medium that speeds up drying time,..oils seem to have a more rounded selection of ones in its colour range,..and i find them great for painting natural subjects,..their consistancy difffers also,..oil can be diluted a lot with either oils or white spirit and a number of other mediums and still keep the colour strenght and be very fluid on the brush where i find thta acrylics get very gritty as you dilute them,.....hmmm,..ingredients,..ithink acrylics are more chemically based whereas oils use pigment tones that can be found in nature,..but im not 100 % on that one,..hope this helps,..all the best,..alan

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