Streaky, dull, or soft set in chocolate: what causes it?

Likely causes: Improper temper, so the wrong crystal form dominates. Room too warm. Insufficient agitation while cooling. What to change: Re-temper, by seeding or by tabling. Set at 65 to 68 °F (18 to 20 °C) with low humidity. Agitate to build the crystal network.

Chocolate

Streaky, dull, or soft set

3 likely causes, sorted by where the problem lives. Work down the list and change one variable at a time.

Likely causes

techniqueImproper temper, so the wrong crystal form dominates.
environmentRoom too warm.
techniqueInsufficient agitation while cooling.

What to change

Re-temper, by seeding or by tabling.
Set at 65 to 68 °F (18 to 20 °C) with low humidity.
Agitate to build the crystal network.

Read it with the four domains in mind

FormulaThe recipe itself: ratios, quantities, and ingredient choice.

TechniqueWhat you did: mixing, shaping, timing, handling.

EnvironmentThe room: temperature, humidity, altitude, storage.

EquipmentThe gear: oven calibration, pans, mixer, tools.

Adapted from the master symptom matrices in Environmental Variables & Troubleshooting. General sourcing across these tables: Figoni (2011); Gisslen (2016); Corriher (2008); McGee (2004); Modernist Bread (2017); King Arthur Baking technical guides; BAKERpedia.

Other chocolate symptoms

Fat bloom: grey streaky film that smears when rubbed Sugar bloom: gritty dry surface that does not smear Seized into a grainy stiff mass Too thick to coat

Chocolate & Confectionery · The full troubleshooting method · All 50 symptoms