Try applying 3-4 coats of white gesso to your next blank canvas and see if that makes any difference in the strength of your colors when you paint. Another technique to make your paint more opaque is to add a small amount of white gesso or white paint.
Increasing opacity can be accomplished by either adding a medium to the layer or adding a layer to create a textured surface.
Apply Artists' Painting Medium sparingly to a clean cloth and rub gently into any sunken areas. Wipe off any residue and leave to dry for a day or two. If you can still see smaller dull areas then repeat the process until the painting has regained an even sheen. Avoid using varnishes to refresh a dead painting.
Use burnt umber, then black to darken. Yellow scale, use yellow light then white to lighten. Use yellow ochre, then burnt umber to darken. Green scale, add white to lighten, add black to darken.
Add black to change the shade of red and make it richer.
Combining black with any color will create a darker shade of that color. This is the most straightforward way to make a color darker. Start small, with 1-part black for every 30-parts of red to ensure that you don't overdo it when mixing your paints.
There are several colors that you can add to your yellow paint to make it darker, including red, orange, purple, and brown. You can also mix different shades of yellow together, for example, you can add yellow ochre to a bright shade of yellow to darken it.
It's necessary to varnish an oil painting in order to protect the paint film. Since resin is the essential ingredient of a varnish, it's more convenient to purchase a varnish than to make your own. There are traditional varnishes made with traditional resins, the most common of which is damar.
You would need an oil-specific ground and/or primer (I will not go into this process today because it is not something I have personally tried). So, once again, you can create an oil painting over traditional Gesso, but you cannot apply gesso over an oil painting.
Creating an "oil-like" acrylic painting (opaque technique)
Use a canvas-covered medium. Dilute your colors just slightly with water, or use them straight out of the tube. Start by applying color to the largest areas, then add the various motifs of your composition.
Cobalt blue is a clean blue that is neither warm nor cold. With a moderate tinting strength, it is useful on the palette for muted colour mixes. It is semi-transparent in both Winsor & Newton Artists' Oil Colour and Professional Watercolour.
DANIEL SMITH Prussian Blue is lightfast and transparent, with medium to high staining strength. It disperses and diffuses easily and evenly and can be considered interchangeable with the higher staining Phthalo Blue in application, although Prussian Blue is slightly greener.
Natural Pigments on the other hand, shares a more commonly touted timetable, “The best practice is to allow the bulk of the oil paint to cure (polymerize) before applying the varnish. The typical advice to wait 6 to 12 months for most paintings before varnishing makes perfect sense.
Nevertheless, "linseed oil varnish" can be produced from raw linseed oil, which is used both as a clear varnish and in highly filled systems. Linseed oil varnish as a natural wood protection has been used for many decades.
Work in thin layers.
2-3 layers should be fine, a sprayed coat of varnish will dry within 10 minutes and subsequent coats can then be applied, always allow the previous coat to dry first. As many as 20 – 50 coats can be applied for a super glassy effect.
The varnish lies on top of less absorbent areas and sinks down into more absorbent areas. We recommend a process called “oiling out” prior to using Gamvar. Oiling-out reduces the absorbency of dull paint layers, unifies the painting's appearance and allows Gamvar to cover more evenly.
Apply the varnish in one to three thin coats, rather than one thick coat. Use long, even strokes from top to bottom, moving gradually from one side to the other. Remove any bubbles. Avoid going back over areas that you've done.
To make a color darker (this is called a shade of the original color), add a small amount of black. If you add too much black, your color will be almost black. Another way to darken a color is to mix in some of the complementary color (the opposite color on a color wheel - see below).
Making Yellow Paint Darker
To do that with paints, the key is to add shades that complement yellow. Specifically, you can use orange, gold and purple, though red, green and brown can also be used to create darker shades of yellow.
ByBrittney. In order to lower the yellow, you should paint it a little green violet. Yellow is complementary to violet in that it adds color. During the addition, you'll have either “knocking the color down” (rendering it lighter without negatively impacting it's intensity) or “making it darker”.