Mottling in solids on GC board
Medium severitySymptoms
Cloudy, mottled solids, especially midtones and color masses on GC1/GC2
Probable causes
- Board coating with irregular absorption (typical of economy GC grades)
- uneven ink penetration
- insufficient pressure
The Print Guy · 2026-10-05
Other problems in this category
Substrates GC/Bond/Coated · TPG-108
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Waves across the sheet, tail-end wrinkles, delivery jams
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Grammage change mid-job or between reorders
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