# Drawdown card

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**Drawdown cards** are used for testing [paints](/source/Paint) and [coatings](/source/Coating) through [wet film](/source/Wet_film) preparation.

Black and white cards are used to measure both [opacity](/source/Opacity_(optics)) and [contrast ratio](/source/Contrast_ratio).[1] By measuring reflectance values of both parts of the card one can gain a quantitative opacity value of a paint sample.[2]

## References

1. ["Paper, Film and Foil Converter 1987-08: Vol 61 Iss 8 : Free Download, Borrow, and Streaming : Internet Archive"](https://archive.org/details/sim_paper-film-and-foil-converter_1987-08_61_8/page/177/). *Internet Archive*. 23 October 2016. Retrieved 22 February 2026.

1. Charvat, Robert A. (23 October 2016). ["Coloring of plastics- Fundamentals Second Edition : Robert A. Charvat : Free Download, Borrow, and Streaming : Internet Archive"](https://archive.org/details/coloringofplasti0000unse_f4z5/page/231/). *Internet Archive*. Retrieved 22 February 2026.

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Adapted from the Wikipedia article [Drawdown card](https://en.wikipedia.org/wiki/Drawdown_card) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Drawdown_card?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.