Domain: Natural Science — Environmental Science
Target concept: Polycyclic Aromatic Hydrocarbons Detection (Fluorescent Paper Test)

Video generation prompt: Immerse the fluorescent test paper in the water sample containing polycyclic aromatic hydrocarbons for 10 seconds, then place it under a UV lamp.

Evaluation guide:
(i) Target concept: Fluorescence-based on-site detection of polycyclic aromatic hydrocarbons in aqueous samples using functionalized paper.
Minimum mechanism: The test paper must be pre-coated with a fluorogenic reagent (e.g., surfactant-embedded pyrene derivative) that forms emissive complexes with PAHs; UV-A (365 nm) excitation must trigger radiative decay in visible yellow-green band (~520–560 nm); water must act solely as carrier, with no intrinsic fluorescence or quenching.
(ii)Storyline: [Phase 1: Immersion] Paper enters water: surface wets uniformly, no beading; water meniscus forms at edges. [Phase 2: Removal] Paper lifts vertically: water clings as coherent film/droplets; no splashing or shearing. [Phase 3: Positioning] Paper placed centered under UV lamp, with no rotation or tilt; lamp housing visible, violet-purple glow initiates only upon activation. [Phase 4: Observation] Instantaneous yellow-green fluorescence emerges *only* on immersed region of paper; emission ceases immediately if lamp deactivates or paper shifts out of beam. Perspective: Fixed frontal close-up framing entire paper + lamp base + water container in consistent plane; no occlusion of paper surface at any stage.

Manual:
Experimental Procedure
1. Hold fluorescent test paper by edge and fully submerge in water sample for visible duration.
2. Remove paper and hold steadily.
3. Place paper directly beneath active UV lamp.
Observation of Experimental Phenomena
Fluorescent test paper emits uniform yellow-green light exclusively when under UV illumination — no glow before, during immersion, or after removal without UV.
Summary of Experimental Principles
PAHs in water bind to fluorescent reagents on the paper; UV light excites these complexes, causing emission of characteristic yellow-green fluorescence — a direct, rapid, on-site detection signal.

Prompt Grounding rubric:
level_1: No fluorescent test paper is shown; no water sample container appears; no UV lamp appears; none of the three required objects are present, and neither the immersion step nor the UV illumination step occurs.
level_2: Only one of the three required objects appears (just the test paper, or just the water container, or just the UV lamp); the immersion action and the UV illumination action are both missing, or the paper is shown without ever touching the liquid or ever being placed under the UV lamp.
level_3: The test paper, water sample container, and UV lamp are all shown; the paper is visibly dipped into the water sample for a continuous, uninterrupted stretch of time with no cutaway mid-dip; the same paper is then placed directly under the UV lamp; the sequence follows dip, then remove, then expose to UV, in that order.
level_4: The test paper, water sample container, and UV lamp are all shown; the paper is dipped continuously into the water and then placed directly under the UV lamp with that order intact; the paper looks the same before and after the dip, with no color change appearing while it's still in the water; the UV lamp only switches on once the paper is already positioned beneath it; the paper sits fully within the lamp's illuminated area throughout the observation.
level_5: The test paper, water sample container, and UV lamp are all shown, dipped continuously and then placed under the UV lamp in the correct order; the paper looks unchanged during the dip itself; the lamp only turns on after the paper is in place, and the paper stays fully lit throughout; the paper remains completely still under the lamp for the whole observation; visible droplets cling to the paper right after it leaves the water and stay until the UV exposure begins; nothing (gloves, tweezers, a label) blocks the view of the paper's surface during either the dipping or the UV-viewing stage.

Scientific and Causal Correctness rubric:
level_1: The test paper shows no glow at all under UV light; or it glows while still in the water, before any UV exposure; or it glows the wrong color, such as blue or plain green rather than the expected yellow-green; or the water itself seems to glow instead of the paper.
level_2: The paper glows under UV light, but in a color inconsistent with a PAH-fluorescence reaction, such as red, purple, or white; or a glow is visible before the UV lamp is even turned on; or the glow only shows up in patches or at the edges while the middle of the wetted area stays dark.
level_3: The paper glows only once the UV lamp is on, never before or during the dip, and the glow appears on the paper's own surface, not on the water or container; the glow is a yellow-green that stands out clearly from the background and from the lamp's own violet light; and the glow stays on continuously the whole time the lamp is on.
level_4: The paper only glows once the UV lamp is on, in a yellow-green that stands out from the background and the lamp's own violet light, staying on continuously for as long as the lamp is on and appearing on the paper's own surface rather than the water or container; the glow looks evenly bright across the whole area that was dipped in water, without streaks, patches, or blotches; and no glow appears anywhere on the dry part of the paper outside the wetted area.
level_5: The paper only glows once the UV lamp is on, in a yellow-green that stands out from the background and the lamp's own violet light, evenly across the wetted area with no glow on the dry margin; the glow appears right when the lamp turns on, without a noticeable delay or slow fade-in, and disappears right away once the lamp switches off or the paper is pulled out from under it, with no lingering afterglow.

Spatiotemporal Consistency rubric:
level_1: The paper seems to jump straight from being in the water to being under the UV lamp with no transition shown; or its size or orientation changes abruptly between shots; or the ambient lighting disappears suddenly rather than fading; or the paper visibly tears, bends unnaturally, or the container breaks apart between one moment and the next.
level_2: The dip and the UV exposure are shown as two separate static shots with no visible hand or paper motion connecting them; or a shadow on the paper or container shifts abruptly between the two phases; or the UV lamp appears to be switched on while the still-dripping paper is shown in a position that couldn't physically be under it yet.
level_3: Everything happens within one continuous shot with no camera cuts or angle changes; a hand or tool carries the paper smoothly from the water container to the UV lamp; the lighting stays visually steady apart from the UV source turning on; shadows and reflections on the paper and container change naturally as it moves and as the light comes on.
level_4: Everything happens within one continuous shot with no camera cuts or angle changes; a hand or tool carries the paper smoothly from the water container to the UV lamp; the lighting stays visually steady apart from the UV source turning on; droplets hang from the paper's edge after it's lifted out and fall at a believable pace rather than floating or vanishing instantly; the paper's orientation stays steady during the move with no sudden twisting or flipping; the UV light forms a clear, localized bright patch on the paper matching where the lamp actually is.
level_5: Everything happens within one continuous shot with no camera cuts or angle changes; a hand or tool carries the paper smoothly from the water container to the UV lamp; droplets fall at a believable pace and the paper's orientation stays steady throughout; the UV light forms a clear, localized bright patch matching the lamp's position; the whole motion from water to lamp looks smooth with no strobing or jarring jumps that would make it hard to tell where the paper's edges are; the paper is clearly closer to the water container during the dip than to the UV lamp during exposure, and the background doesn't shift in a way that contradicts the paper's own movement.