Domain: Natural Science — Chemistry
Target concept: Adding a baking soda solution to the cabbage indicator results in a blue-green color.

Video generation prompt: On the table, two transparent beakers contain purple cabbage indicator; the clear baking soda solution is added only to the right beaker, and both beakers are gently shaken.

Evaluation guide:
(i) Target concept: Acid-base indicator color response to alkaline conditions.
Minimum mechanism: Purple anthocyanin pigments in cabbage extract undergo reversible structural change in alkaline pH, shifting absorption spectrum to reflect blue-green wavelengths; solution must remain dilute and aqueous, with no competing ions or degradation.
(ii)Storyline: Frame 0–2: Static wide shot showing two identical transparent beakers, both filled with homogeneous purple liquid, aligned side-by-side on table surface. Frame 3–5: Clear liquid dispensed from above into right beaker only: tool enters frame, delivers solution, exits; no contact with left beaker. Frame 6–8: Both beakers undergo identical gentle oscillatory motion (hand-held or mechanical): liquid surface ripples uniformly, no spillage. Frame 9–10: Final static shot held for ≥0.5s: right beaker displays stable, uniform blue-green; left beaker retains uniform purple; full side-by-side view preserved; lighting even; no occlusion.

Manual:
Experimental Procedure
1. Place two transparent beakers side-by-side on a table; fill each with purple cabbage indicator.
2. Add clear baking soda solution exclusively to the right beaker.
3. Gently shake both beakers.
Observation of Experimental Phenomena
The right beaker turns blue-green; the left beaker remains purple.
Summary of Experimental Principles
Adding a baking soda solution to the cabbage indicator results in a blue-green color.

Prompt Grounding rubric:
level_1: Neither beaker in the shot is a transparent container holding purple cabbage-indicator liquid; no clear baking soda solution is shown being added to anything; no shaking motion happens to either beaker.
level_2: Two beakers are shown, but at least one isn't transparent or doesn't hold the purple liquid; a clear solution is added, but not exclusively to the beaker on the right; only one beaker gets shaken, or both get shaken with no way to tell them apart; the beakers aren't placed next to each other.
level_3: Both beakers are transparent, sit next to each other, and are visibly filled with purple liquid; a clear solution is added to only one of them (the one on the right) and both are then shaken, but the shaking happens before the addition, or the camera angle or an obstruction makes it unclear which beaker actually received the solution.
level_4: Both transparent beakers sit side by side, each starting out filled with purple liquid; the clear baking soda solution is added only to the right-hand beaker, with the left beaker never touched by it; both beakers are gently shaken only after the addition; every object and action from the prompt is present with nothing extra or missing.
level_5: Everything from level 4 holds, and in addition: the beakers stay upright and don't tip or slide during the whole sequence; the solution is delivered by a clearly visible tool such as a dropper or pipette, entering from above into the right beaker only; the shaking looks gentle and even, applied the same way to both beakers with no jerking or spilling; nothing (a hand, a label, a glare) blocks the side-by-side view of the two beakers at any point.

Scientific and Causal Correctness rubric:
level_1: Neither beaker changes color at all: both stay purple the whole time; or both beakers change to the same non-blue-green color (e.g., both turn pink or yellow); or the color change happens in the left (untreated) beaker instead of the right.
level_2: The right beaker changes color, but to something clearly wrong for this reaction (red, pink, yellow, or gray); or the color flips instantly in a single frame rather than shifting gradually; or the left beaker shows any hint of color change even though nothing was added to it.
level_3: The right beaker shifts to a color visibly different from its original purple (somewhere in the blue-to-green range, including teal or cyan-like shades), while the left beaker stays purple; but the new color looks muddy, grayish, or otherwise hard to place anywhere on the blue-green spectrum, or it flickers/reverts partway through instead of settling.
level_4: The right beaker settles into a clear, stable color somewhere in the blue-green range (teal/cyan shades count), obviously different from both its own original purple and the still-purple left beaker; the left beaker's purple stays even and uniform with no gradient or stray discoloration; the two beakers' colors are easy to tell apart under normal lighting.
level_5: Everything from level 4 holds, and in addition: the right beaker's final color sits clearly between blue and green (a teal/blue-green hue rather than snapping back toward violet-blue or advancing all the way to yellow-green), with no odd color fringing or oversaturation; the color inside the right beaker looks even throughout, with no streaks or unmixed patches; the left beaker's purple looks identical in shade and brightness before and after the shaking.

Spatiotemporal Consistency rubric:
level_1: A beaker or its liquid appears or disappears abruptly between frames; the room lighting suddenly switches to a different brightness or color within a single cut; a beaker's shape warps, bends, or looks like it's melting; the shaking makes liquid splash or float in a way gravity wouldn't allow.
level_2: One beaker shifts position or rotates while being shaken but the other one doesn't move at all; the dropper/tool used for adding solution appears or disappears without a visible motion path; the color change starts before the solution has actually finished being added; the shaking looks like a jump-cut or freezes and stutters instead of moving continuously.
level_3: Both beakers stay in their side-by-side spots the whole time; the adding and shaking happen as one continuous motion; but small inconsistencies remain: a shadow that doesn't quite match between two frames, one beaker briefly blocked from view during shaking, or a brief moment where the glass looks unnaturally see-through or opaque.
level_4: All motion looks smooth and physically believable: the liquid pours continuously into the right beaker; the shaking is gentle, rhythmic, and matches in amplitude and direction between both beakers; neither beaker deforms, the lighting never jumps, and the beakers keep the same relative position and orientation throughout.
level_5: Everything from level 4 holds, and in addition: the liquid surface in each beaker dips and sways naturally and consistently while being shaken; there's no ghosting between frames or blur that hides the color; reflections on the glass move together with the camera and light source; both beakers look like they're sitting at the same depth, with no mismatched perspective between them.