Princeton Velvetouch Synthetic Angle Shader Brushes Size_1/8 INCH Is this ink safe for

Is this ink safe for vintage or gold nib pens

steel polished fittings

A channel inside the technical pen ensures optimum pressure equalisation

it is 100 percent biodegradable

Set Contents: Contains Promarkers: 5 x Black & 1 x Blender

Princeton Velvetouch Synthetic Angle Shader Brushes Size_1/8 INCH Is this ink safe forThe Princeton Velvetouch is more than a new brush, it is next generation technology! Containing a blend of luxurious NextGen synthetic filaments, Princeton Velvetouch Series 3950 Synthetic Brushes are the ultimate mixed media tool for watercolors, acrylics, and oil paints. The Velvetouch line includes a full range of traditional shapes, plus specialty brushes such as long rounds with exceptionally sharp points, oval mops, script liners, and spotters