Portrait; single-sided Primary: 0.323- 0.342 mm Secondary: 0.292- 0.293 mm Both supports are machine made. The primary support it taupe colored paper with red and blue mixed fibers. Clumped fibers are visible in transmitted light and the surface is textured. The primary support is thicker than the secondary support but with less sizing (softer). The secondary support is a brown support; high degree of fillers (opaque in transmitted light). The felt side of support is facing up. Same primary and secondary support as 0227.140.