{"version":"emaki-charging-v40-1","scope":"16 local trunk swatches and one tree application with an added-time control; no novice transfer or calibrated physics.","material":{"model":"paper-brush-v4","resolution":640,"roughness":0.26,"absorbency":0.42},"canvas":{"profile":"watercolor-study-v2","aspectRatio":"3:4"},"output":[720,960],"intent":"Legible outer contour with a soft interior shadow fading upward from the root.","recipe":["Start with a pale low-water trunk brush. Example: water .012, opacity .62, dry .12, duration .6.","Paint a centered water-only pass inside the exposed trunk, nominal width .60 of the base, water .14, duration .45; keep away from foliage.","Wait .1 material seconds.","Place shadow slightly to one side INSIDE the wash with width .44 of the base, water .022, opacity .62, duration .4. Taper pressure continuously toward .05 at lift-off.","Inspect immediately, after 1 second and after 3 more seconds; compare the full painting before adopting."],"failures":{"wholeTrunkWaterIncrease":"Interior mixes but the outer edge also spreads.","shadowOutsideWetBase":"Dark independent line survives; correct physical path and contact before adding more water.","abruptShadowEnd":"Two high-pressure stops leave caps/bands; a continuous tapered pass improved this trunk.","waitingOnly":"Longer delay did not remove the bad stroke geometry.","excessLocalWater":"More water was not better; .42 showed more disturbed tone than .14 in the tapered comparison."},"limits":["Example water/width values apply to this roughly 17.68px nominal trunk, not all subjects or models.","Low-water base cells can begin fixed in this model; this is not a claim of real-world full drying.","Wet regions are not clipping masks. Narrow interior passes can still spread outside.","Changed material time affects the whole sheet; review surrounding foliage and thin branches.","The reference artist's actual sequence is unknown; this is a technique adaptation.","Tree topology and overly legible branch junctions remain unresolved."],"sources":["https://www.louisedemasi.com/tips/2023/5/23/a-watercolour-technique-for-beginners-called-charging","https://www.eckersleys.com.au/media/wysiwyg/blog/Projects/WN-PWC-Sunrise-Tutorial/WN-PWC-CAD-FREE-SUNSET-TUTORIAL.pdf"],"evidence":"Local docs/71-trunk-charging-study.md and artifacts/trunk-charging-v40 contain unchanged runtime hashes, all inputs, actual stage images, decisions and budget/replay verification.","validation":{"visual":"16_local_swatches_and_one_tree_application","novice":"not_tested","example":"schema_and_replay_checks_recorded_locally"}}