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I have had that especially with Vallejo premium matt little bits at the top crystallise then fall into the main solution but They never seem to dissolve back into the paint and clog my brush after a longer period of time. Same thing happens with ultra matt but they are soft balls instead of sharp crystals. For both, either filter the remainder of the bottle through tights (you could use other fine mesh) wash the bottle and put it back in or sometimes I cut a small square of tights and close the bottle over it so it’s between the bottle and nib making a poor man’s in line filter until the bottle is done or I need to replace the filter after 3 months or so.