Rublev Colours Lead Oil Ground
Rublev Lead Oil Ground is a blend of white pigments and linseed oil for a semi-absorbent ground ideal for oil painting. Rublev Colours Lead Oil Ground contains ground calcite, lead white and titanium white in just the right proportions to make a paint film that remains flexible and tough with some absorbency. The blend of linseed oil provides penetration into the support to ensure good adhesion yet maintain sufficient holdout to form a good foundation for paint layers. It provides the good leveling properties, so brush and knife marks are minimized. Rublev Colours Lead Oil Ground has a high concentration of pigments so only two coats are usually necessary, but more coats create smoother surfaces. Apply directly onto panels without sizing or on canvas sized with PVA or rabbit skin glue. Rublev Ground is an excellent foundation for oil and alkyd paints.
The important characteristics that grounds should have are (1) adhesion, 2) flexibility, 3) penetration control, 4) a type of surface to which upper layers can adhere well, 5) blister and crack resistance, and 6) good application properties. Careful selection of ingredients in an oil ground is essential to impart these qualities to the ground. Ground natural calcite (calcium carbonate) in combination with lead white (basic lead carbonate) and a maximum chalk resistant grade of rutile titanium dioxide have proven to be an excellent choice of pigments in such oil grounds.
Three Pigments
We make Rublev Lead Oil Ground #1 using all three white pigments; calcite, lead white and titanium white in just the right proportions to make a film that remains flexible, tough and has some degree of absorbency.
The dry ground calcite we use in Rublev Lead Oil Ground #1 has a closely controlled particle size distribution. This grade of calcite is designed to provide the lowest possible oil absorption. It offers the desired penetration control with maximum chalk resistance. Calcite aids in forming the type of surface on grounds to which upper layers will adhere easily.
Lead white, and to a lesser degree, ground calcite, have low water absorption properties and hence develop better blister and crack resistance. Furthermore, lead white contributes to more film flexibility.
The presence of titanium white increases the opacity of this ground and provides a brilliant white surface. We have selected a grade of titanium white that exhibits good hiding and excellent dispersion properties.
Does Not Contain Zinc
Many manufacturers use zinc white to get a brighter white in their white grounds and paint. Zinc oxide is not recommended in oil grounds, since it tends to cause blistering and cracking in oil paint and grounds -- we have not used any zinc in this product.
Pure Linseed Oil
After many trials, we have carefully chosen a specific blend of refined and raw linseed oil with heat-bodied linseed oil such that there is a limited penetration of the oil into the canvas or panel to assure good adhesion to this substrate and yet maintain sufficient holdout to establish a good foundation for the upper layers. This blend of linseed oil also provides the best possible leveling properties, so brush and knife marks are minimized.
Questions and Answers
Can Rublev Colours Lead Oil Ground #1 be thinned with turpentine for application?
Rublev Colours Lead Oil Ground can be thinned with turpentine or mineral spirits. It is the consistency of heavy cream, so it can be used straight from the can and applied with a brush or knife. This consistency is best suited to penetrate the weft and warp of canvas or the grain of wood panels.
If I applied a single coat of Rublev Colours Lead Oil Ground #1 on sized canvas would that be sufficient as a ground for oil painting?
We recommend at least two thin coats over a sized canvas or panel, as opposed to a single thick application of lead oil ground. This ensures even coverage of the ground and speeds drying and curing.
After applying, how long do I have to wait before I can paint over it?
That depends on many factors, such as the relative humidity, temperature, light exposure, application thickness, substrate absorbency, etc. It is difficult to give a recommendation that covers all applications, but we recommend waiting at least 14 days before painting over it and more time may be required.
What role does the calcite play?
We use a medium dry ground calcite in Rublev Colours Lead Oil Ground #1 that has a closely controlled particle size distribution. This grade of calcite provide the lowest possible oil absorption, reducing the amount of vehicle necessary to make a flowing ground and allowing it to contain more pigment (pigment volume concentration or PVC). High PVC (above 40%) provides a stronger film and with calcite gives the grounds the desired penetration control with maximum chalk resistance. Calcite aids in forming the type of surface to which upper layers adhere easily -- it provides the "tooth" necessary for good adhesion.
What type of bodied oil is used as an ingredient of Rublev Colours Lead Oil Ground #1?
Rublev Colours Lead Oil Ground #1 contains bodied linseed oil that is heat treated in a vacuum until it reaches Z6 (Holt-Gardner scale) viscosity -- about the consistency of honey.
How to Use
Apply the ground undiluted or thin with a small amount of mineral spirits or gum turpentine, if you find the ground too thick to spread easily, in a very thin layer with a palette knife or plastic trowel or brush.
Use a brush to smooth out any knife or lap marks to obtain an even, consistent coating.
Allow the ground to dry overnight and apply a second coat.
You can begin painting when the ground has dried thoroughly, usually 14 days in warm environments and longer in cool, damp environments.
You can dilute Rublev Colours Lead Oil Ground with mineral spirits or gum turpentine for thinner coats that are easier to spread over pre-primed canvas or boards with acrylic dispersion grounds.
WARNING: CONTAINS LEAD. Harmful if swallowed. When using do not eat, drink or smoke. Avoid ingestion and skin contact. Wear gloves and protective clothing to avoid exposure to broken skin. If swallowed, do not induce vomiting. Call physician immediately. KEEP OUT OF REACH OF CHILDREN.
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 Rublev Colours Artists' Oils let you experience what the old masters well understood—the unique characteristics of pigments. The pigments used by old masters in their paintings were ground from natural minerals and earths, fermented in dyer vats and concocted in alchemist laboratories. Rublev Colours Artists' Oils give you the same pigments used by the old masters prepared with linseed oil as ready-made paints.
Most oil colors today are made to feel the same under the brush. Their consistency is short and buttery, irrespective of the color. Whereas a short and buttery consistency is good, there are many times when you want paint that has a different feel. Sometimes you need paint that flows. Other times you want a long and perhaps even ropey paint. Or one that flows when brushed then thickens upon standing, which is called thixotropic paint. That is why so many painters today resort to using mediums with their tube oil colors—to alter the consistency of their paint.
The Rublev Colours Difference
Why are Rublev Colours different from other commercial oil colors? One reason is that we use natural pigments or historical reproductions of pigments used by the old masters. Another reason is that we make Rublev Colours Artists’ Oils as they did before modern tube colors—without additives. Rublev Colours Artists’ Oils are formulated to maintain the unique characteristics of each pigment in oil. The character found in each tube of our oil colors is unique due to the pigment inside, giving the artist nearly limitless choices of texture, opacity, consistency, tone and hue. With Rublev Colours you experience the transparency of yellow ochre, the pale coolness of green earths, and the crystalline glitter of deep blue azurite.
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