Cauliflower blooms and backruns
“Strange jagged watermarks and pale blossoms appeared across my wash while it dried.”
What is happening
Pale spots with hard, dark, fringed outer contours form inside an existing wash. These cauliflower-like shapes push pigment aside and break up smooth areas of tone.
A backrun happens when wetter paint or pure water is added into a section of wash that has already lost its surface sheen and begun to dry. The excess moisture rushes into the drier region by capillary action, pushing pigment out to the perimeter.
The 30-second test
Check the wet wash at eye level; if an area is dull while adjacent paint still has a mirror shine, water added to the dull patch will cause a bloom.
How to fix it
- Let the blooming wash dry completely before attempting any correction.
- Dampen a stiff synthetic flat brush with clean water and squeeze out most moisture.
- Gently scrub along the hard dark rim of the bloom to soften its edge.
- Blot the lifted line immediately with a corner of dry paper towel.
- Re-glaze the whole passage with a uniform, slightly darker tone if necessary.
Can it be saved? Rescue
Softening the hard circular outline with a damp flat brush makes blooms blend back into the surrounding wash.
Drill: Moisture balance swatches
About 20 minutes. You need:
- Watercolour paper
- Medium round brush
- Burnt sienna
- Water jar
Paint four dark rectangles. Drop wet water into them at distinct drying stages: soaking wet, shiny, satin, and nearly dry, to observe exactly when blooms trigger.
Background reading
General teaching sites on this subject. They are a reading list, not page-level citations for this advice.
The advice is a generated synthesis of common teaching practice and has not been checked line by line against any source; treat times and difficulty as estimates.