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Yep. Thinning the wash will lower the intensity, resulting in lighter shading. Plain water will work, to a degree, but too much will alter the consistency and flow. If you want it to behave the same, you need to add more of a "wash base," which amounts to a mix of water, acrylic medium, and a surfactant (sometimes with a drying retarder thrown in). Lahmian Medium would work, as would any of the various airbrush mediums (which are thin and high-flow, to begin with).
Generally, I just use water to thin washes, as I know how they'll behave and can account for the changed properties. If I'm mixing up a custom acrylic ink wash or wanted to really thin out something pre-mixed, I use a mix of water and Pledge Floor Care (a Future/Klear alternative), a thin, high-flow acrylic product.
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