Prepare masstones and white and black letdowns exactly as described in the user's manual for your formulation package.
The components of colorant samples and known standards should be weighed and recorded to two or more decimal places.Colorant primaries should be prepared in the same way as your finished product, with all appropriate resins, extenders, and solutions at their normal loading levels using your most commonly-used substrate.If you are measuring paint for the purpose of performing color formulation with a HunterLab product such as EasyMatch Coatings, you should also consider the following: If you need help doing so, measurement methods for paint using our various instruments can be found on HunterLab's web site, Additional Tips for Color Formulation Apply enough layers to make the painted area completely opaque, if possible for the paint you are sampling.Īfter the paint is completely dry, you can measure the drawdown on your instrument as you normally would. Follow the instructions given in the user's manual for your device to operate it optimally. A drawdown bar (as shown above) or spray gun provides the best means of doing this. The paint must be applied to the opacity card in an even coat as soon as possible after mixing. Paint being applied to an opacity card is shown in the picture below. On the other hand, if a completely opaque drawdown cannot be achieved, then the opacity card conveniently allows measurement of opacity using first the portion backed by white, then the portion backed by black. When the two areas appear the same, then a sufficient opacity of the paint has been achieved. These cards have a black portion and a white portion so that when paint is applied over both areas, they can be visually compared as the layers are applied until they appear identical. Opacity cards, such as those sold by The Leneta Company (provide a flat, solid surface on which paint can be smoothly and evenly applied. The end result should be a fully homogenized paint sample with no lumps or streaks of color. Our products are available worldwide through a. If you are stirring manually, be sure to stir from the bottom upward. Our experienced staff is uniquely qualified to offer technical support to meet the needs of the paint chemist. Mix the paint thoroughly, preferably using a motorized mixer. If it is important that you know the exact amount of each color used, measure the colorants out using an analytical balance (one that measures to at least two decimal places) or a dispensing system that can deliver specific shot sizes. This Applications Note provides guidelines on making good drawdowns for consistent and accurate color measurements.ĭrawdowns should be made in a clean space where there is no chance of contamination from unwanted paint or particulates while the sample paint is being mixed, applied to the card, or is drying.Īdd the colors to be mixed to the paint container beginning with the largest quantity and working down to the smallest quantity. When the paint on the card is dry, it can then be placed at the instrument's sample port for measurement. One of the best ways of measuring the color of paint using your HunterLab instrument is to create a 'drawdown' by applying the paint evenly to a card.
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