Tinting latex paint


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Old 09-06-00, 11:26 PM
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I would like to adjust the color of 2 gallons of paint I already own. Can I purchase the actual tints that the paint stores use? What should I ask for at the art store, assuming that Home Depot doesn't sell the tint itself? I would prefer to take the time to try tinting it myself rather than have the paint store do it.

Also, does anyone know how much, for example, "3/16 of Yellow Oxide" or "1/16 or Red" actually translates into? Is there a way to calculate tint amounts into ounces or teaspoons?

Thank you very much.
 
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Old 09-07-00, 07:52 PM
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Can I purchase the actual tints that the paint stores use? In some cases. Ask! (It's best to take small clean jars with you).

What should I ask for at the art store, assuming that Home Depot doesn't sell the tint itself? Universal tinting colors may be used most of the time, but ask if the paint is compatible with universal tinting colors first. (If they don't know: when the tint tends to streak through the mixture it's not compatible). (If the tint floats on the surface either too much tint has been used for the base or it's incompatible).

Also, does anyone know how much, for example, "3/16 of Yellow Oxide" or "1/16 or Red" actually translates into? Is there a way to calculate tint amounts into ounces or teaspoons?

3/16 and 1/16 refer to Ounces. The translation is doable (the easiest is via Minims) but some explanation may prove helpful.


Minims are an Apothecaries Unit. Many U.S. borne paint tinting machines are based on Minims. Volumetric conversion to Cubic Inches is almost exclusive to the U.S. Metric conversion is the norm for calibration and most of the World. Minims are the reason behind 1/48 markings on most U.S. borne tinting machines. (1/96 on some machines).

1 Ounce Apothecaries' fluid measure = 480 Minims.
Thus 1/48 Ounce = 10 Minims and 1/16 Ounce = 30 Minims.
Also: 60 minims = 1 Fluid Dram AND 8 Fluid Drams = 1 Fluid Ounce.

Note that 48 is divisible by many prime numbers. Rarely will you find a paint formula where tinting pigments are specified as 1/5, 1/7 or 1/9. 1/4 +3 means 1/4 Ounce plus 3 drops.

Although it's possible to convert Ounces to teaspoons directly, it's advisable to convert to Minims first, (as a formula check), then to teaspoons or drops if necessary. Why: First, it's easier. And the nearer to standard assumptions used, the easier it will be to match the color later on. Anything less than 1/48 is hard to duplicate on the second try.

Before beginning write down the base used and/or color then record each addition. Always add tint slowly, mix, then add more if necessary. Tint base and usually plain white will hold up to 4 oz. per gallon. The less tint used, the better. If you're playing with Deep, Ultra Deep, or Accent, it's best to let someone else do this.

Basics:
231 Cu. In. per Gal @ 128 Fl. Oz. per Gal..
1 Oz. = 2 Tablespoons AND 2 Tbsp. = 6 Teaspoons.

Minims /Oz. ---- Conversion
480 Min. --------------- 2 Tbsp.
480 Min. / 2 |240 Min. = 1 Tbsp.

480 Min. / 6 | 80 Min. = 1 Tsp.
480 Min. /12 | 40 Min. = 1/2 Tsp.
480 Min. /24 | 20 Min. = 1/4 Tsp.
480 Min. /48 | 10 Min. = 1/8 Tsp.
480 Min. /96 | 5 Min. = 1/16 Tsp.

Your sample:
3/16 Yellow Oxide = 480/16 * 3 = 90 Min. = 1 1/8 Tsp.
1/16 Red Oxide = 480/16 * 1 = 30 Min. = 1/4 + 1/8 Tsp.

If either result could not be obtained from the table above, reduce, then convert the remainder to drops. There are about 20 drops per teaspoon. Working in drops is not fun. For minute divisions it's sometimes helpful to place a drop on a lid then use a wooded tooth pick to divide it.

If you like numbers, do the ounce conversion math.

231 /128 = 1.8046875 Cu. In. per Ounce (Unity).
:: 1.8046875 / 6 = .30078125 Cu. In. per Tsp..

3 / 16 = .1875
(Unity) 1.8046875 * .1875 = .31201171875
.31201171875 / .30078125 (Tsp.) = 1.125
1.125 - 1 = .125 :: .125 * 16 = 2/16 = 1 1/8 Tsp.

Now, ain't ya'll glad that Minims exist.
 
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Old 09-08-00, 10:32 AM
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Thanks 2000
 
 

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