Domain: Natural Science — Chemistry
Target concept: Paper Chromatographic Analysis of Black Marker Ink Using Water as the Solvent

Video generation prompt: A white filter paper is standing upright in a transparent container, with a black marker dot near the bottom, whose lower edge is in contact with the water surface, and water is penetrating upward.

Evaluation guide:
(i) Target concept: Capillary-driven chromatographic separation of black ink components using water as solvent on cellulose-based filter paper.
Minimum mechanism: Water must contact paper edge → undergo capillary rise → dissolve ink → separate solutes by differential partitioning → produce vertically aligned, ascending, discrete colored bands.
(ii)Storyline: Frame 1: Static setup: upright white paper in transparent container, black dot near bottom, water surface contacting paper"s lower edge. Frame 2–3: Dot begins to swell/elongate vertically without lateral spread. Frame 4–5: First colored band emerges directly above dot, maintaining vertical alignment. Frame 6–7: Additional bands appear in sequence above prior bands, preserving order and spacing. Frame 8–10: All bands continue ascending synchronously, retaining sharp boundaries and vertical collinearity; original dot fully resolved into bands with no residual black mass.

Manual:
Experimental Procedure
1. Place a clean white filter paper upright inside a transparent container.
2. Draw a small black marker dot near the bottom edge of the paper.
3. Add water to the container until its surface just touches the bottom edge of the paper.
Observation of Experimental Phenomena
A vertical ascending pattern develops from the black dot: first the dot elongates upward, then separates into distinct colored bands (e.g., blue, purple, yellow), aligned vertically and progressing upward over time.
Summary of Experimental Principles
Water acts as the mobile phase in paper chromatography; capillary action draws water up the paper, dissolving and separating ink components based on solubility and affinity for the paper (stationary phase). Different dyes migrate at different rates, producing visible colored bands.

Prompt Grounding rubric:
level_1: No upright white filter paper is visible; no transparent container appears; no black marker dot sits near the paper's bottom edge; no liquid surface is shown; the paper's bottom edge never touches any liquid.
level_2: Some elements appear (the paper, the container, the dot, or a liquid surface), but not arranged correctly: for instance the paper lies flat instead of standing upright, the dot sits near the top instead of the bottom, or there's no liquid touching the paper's edge at all.
level_3: An upright white filter paper stands inside a transparent container; a black marker dot appears near the paper's bottom edge; a liquid surface is visible in the container; the paper's bottom edge touches that liquid surface; all of this appears together in one shot from a fixed viewpoint.
level_4: Building on the 3-point description above: the paper stays upright and doesn't move throughout the clip; the dot is a solid black spot (not already smeared, blurred, or discolored) before any migration starts; the container is fully see-through with no tinted or opaque walls; the liquid surface sits level and unbroken; nothing else in the shot blocks the view of the setup.
level_5: Building on the 4-point description above: the black dot looks like one small, well-defined, compact spot at the very start (not already streaked or spread out); the paper stays perfectly upright with no lean or wobble; the container has straight vertical sides and a flat bottom; the liquid surface shows no ripples, curved meniscus distortion, or glare that would hide where it touches the paper; the paper looks matte, the liquid looks glossy, and the container looks like smooth plastic or glass.

Scientific and Causal Correctness rubric:
level_1: Nothing moves upward from the dot at all; no separation into different colors occurs; the black dot just sits there unchanged in shape, size, and color for the whole clip.
level_2: Something moves upward, but not from the dot itself (e.g., an unrelated smudge shifts instead); or the dot's color fades evenly in place without spreading upward; or different colors show up on the paper but not in a sensible vertical sequence (e.g., a color appears far above the dot with nothing connecting it back down to the dot).
level_3: The black dot stretches upward along the paper; at least one distinct colored band (for example blue or violet) appears directly above where the dot started, lined up vertically with it; nothing moves downward or sideways; colored bands only appear above the original dot location, never below or beside it.
level_4: Building on the 3-point description above: several colored bands appear stacked in a sensible order (for instance a blue band sitting below a violet one, or a yellow band below a green one), each clearly separated from its neighbors; no two bands blur into each other; the original black dot visibly shrinks and fades as the bands rise above it, leaving no leftover black mass.
level_5: Building on the 4-point description above: the bands keep rising steadily with no stalling or slipping back down; each band keeps a steady width and a crisp edge as it climbs; colors don't bleed into the bands next to them; no colors appear that wouldn't come from a black marker's dyes (like pink, orange, or brown); no band splits into two or forks partway up; every band stays lined up directly above the original dot's centerline the whole time.

Spatiotemporal Consistency rubric:
level_1: The paper suddenly jumps to a different position or angle; the liquid surface blinks in or out of existence partway through the clip; the black dot flickers out of view and then reappears; the paper bends, folds, or tears with no physical cause visible; the lighting swings wildly between frames (for example, deep shadow in one frame and bright glare in the next).
level_2: The paper leans more than about 15° off vertical at some point; the container rocks enough to tilt the liquid surface by more than about 10°; the dot smears sideways before any upward migration begins; the motion looks jumpy, with skipped moments or repeated frames.
level_3: The paper stays upright and still; the container doesn't move; the liquid surface stays level and unbroken; the dot stays put until migration actually starts; nothing in the scene blinks out of existence and reappears; the lighting doesn't suddenly change; there's no visible tearing, warping, or sudden shift in camera angle.
level_4: Building on the 3-point description above: the paper keeps the same proportions and matte look throughout; the container stays evenly transparent with clearly defined edges; the liquid surface reflects light consistently, without sudden glare or darkening; the bands climbing the paper move smoothly and continuously, without stuttering, jumping, or freezing.
level_5: Building on the 4-point description above: the bands appear to rise at a steady, believable pace without unnatural speeding up or slowing down; the paper's surface doesn't take on an odd glow or glassy look it shouldn't have; the container walls don't warp whatever is visible behind them; the paper, dot, liquid, and container edges all stay in believable spatial relationship to each other; there's no flickering, and any blur present matches the visible motion rather than looking like a rendering glitch.