To obtain a natural look for the veins get a dry sponge and gently tap the veins making the color blend with the ones underneath.
Make plaster of paris look like marble.
How to create a faux venetian plaster look.
In a mixing bowl combine the water with 2 cups 470 ml of white school glue.
And if you can buy plaster pigments that would be another good thing for you.
Avoid following a pattern when painting the veins.
Use this plaster within 15 minutes and let it set 3 days to completely dry.
And if you can get acrylic liquid polymer you can use clear shoe polish and you can polish the things you make and they will look amazing.
Keep in mind you ll want to fill your container up enough to be able to dip the vase inside without the plaster overflowing.
Or you can use it neat.
The resulting plaster will have a soupy consistency.
Following the instructions on the plaster of paris container mix your plaster.
To make plaster of paris with glue instead of flour heat 1 cup 240 ml of water to 100 f 38 c.
To create a marble like venetian plaster effect in your space you can use inexpensive paint and faux treatment tools for a fraction of the price of paying a professional plasterer.
Polished three dimensional faux venetian plaster enhances both the light and dark tones of the same color creating a sophisticated marble like effect.
Use a small paintbrush to add veins which should be thin and random.
Use a sample of marble or a picture as reference.