6100-2400 Qualitative Filter Paper, 24cm Diameter, 1.5 Micron, Slow Flow, Grade 610 (Pack of 100)

Very slooooow flow, but highly effective.For wetplate photographers:I am using it to filter silver nitrate for collodion wet plate photography, as well as filter sandrac varnish. Varnish takes several hours to pass a funnel's worth through (~200mL) but it comes out and comes out clean. Silver nitrate that has been freshly sunned goes faster and comes out clear as water.