Pebeo Setasilk Silk Painting Water Based Gutta 20-Milliliter Tube, Black The colored water based guttas are available in 5 assorted colors packaged in 20ml metal tubes with nozzle The setasilk water based guttas can be used on all types of silk; the colors are air dry in 30 minutes The setasilk water based guttas are fixed by ironing 3 to 4 minutes on the reverse side of the fabric with a hot iron; 48-hour after fixing, the guttas resist hand washing and dry cleaning The Setasilk Water Based Guttas are used directly from the tube and nozzle or from a pipette and Gutta nib