Academic Dividers
"Calipers"
(Please use with due care to prevent injury….the points are sharp!)
Calipers (also known as Academic Dividers) are a tool for confirming measurements when comparing accuracy of features between your portrait and your study photo. Always have a study copy printed to the exact same size as your painting. Using an eye as an example, lets do some comparisons.
Let’s begin with measuring the overall width of the eye on the study photo. Spread the legs of your calipers and place one needle point on the exact outer corner of the eye and the second needle point leg on the exact edge of the tear duct. Lift the calipers off your study photo, being careful not to move the legs. Now place the calipers atop the same eye of your painting. Do the needle points line up on your painting exactly as they did on the study photo? If so, excellent! If not, take note of the degree of difference….is your painting too wide? Too narrow? While the paint is still wet (prior to firing) you have the perfect opportunity to correct your painting to replicate the measurements on the original study photo.
After the overall width is compared, next compare the width and height of the iris, whites of the eyes, space between the eyelid and the bottom of the eyebrow, etc. Comparing measurements is easy when using calipers and the needle points can be safely set atop the wet paint (if you are very careful) and measured without disturbing your wet paint.
The legs should remain rather stiff to allow you to retain the measurement.
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Pink Glaze
Product is mixed with mineral oil (same as regular china paints) and is used as an undercoat ("tooth" coat) over glazed porcelain.
Becky's Personal Experience:
Benefits:
1. Excellent "tooth" coat which aids in transfer of line drawing and I prefer the "feel" versus the slick unpainted porcelain.
2. I typically paiint only the shadow shapes on my portrait first fire painting. It is easier to blend my shadows smoothly and seamlessly on the precoated surface and easier to "see" those areas without the "glare" of uncoated porcelain.
3. Pink glaze gives the painting a beautiful shine right from the beginning fires.
4. I always reserve a few brightest highlight areas which are wiped right back to the bare porcelain (unless doing a dark skin tone). The pink glaze prevents the "glare" of uncoated porcelain in these areas and provides the perfect light color for these areas of highlight.
5. It is my personal experience and opinion that the glaze actually helps my portrait colors retain true color and fade less during firings. (I can make no guarantees (too many variables with different brands of paints, firing temps, etc....just my personal opinion based on my personal experience.)
Becky's Personal Method of Application and Firing Temps:
(Please note that my method differs a bit from Cherryl's recommendations. I include this information only as my personal experience when used as an undercoat for PORTRAITS and it is NOT meant to contradict or override Cherryl's instructions.)
I mix the glaze with my regular mixing medium (basically mineral oil) and apply to the porcelain VERY VERY thinly and very very smoothly (a small amount spreads out a long way) When thinly applied, it will appear VERY light pink when wet. After firing, much of the pink cast disappears and the porcelain appears white (perhaps a pale pink tinge or bit greyed, depending on the color of the porcelain).
I attempt to apply smoothly without residual brush strokes or streaks. However, if I am unable to smooth my application sufficiently, then I will pounce the wet surface very lightly with a silk covered ball of soft batting. (Pouncing will result in less sheen when firing, but the smooth application without brush marks is critically important with portraits.)
I typically fire the undercoat application to 015. When painting the actual portrait, I use Jane Marcks portrait paints, which all fire beautifully at 016. Usually my first and second fires are at 016 and subsequent fires are cooler (017 and finally 018).
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