An FFGL effect that exposes your clip onto a three-layer colour negative, develops each layer along a characteristic curve into dye with an orange mask and grain, then scans and inverts it the way a lab scanner does. Grain that peaks in the mid-tones, the blue shadows of expired stock, a warm light leak that saturates and the warm cast of cross-processing all come from the process itself. There's no lookup table.
This demo runs the plugin's shaders in your browser, so it needs JavaScript and WebGL2. The plugin itself, its source and its downloads are on its repository.