Canson Marker Layout paper 70 gsm, My old and tested paper …

My old and tested paper pad to the right, sometimes a batch would fog but I think it is due my own mistakes in sensitizing. The pad to the left is new to me and I was told it is yhe one they may keep in the shop while the old one (right) will not be avilable on the shelf any more. But is it the same paper or not? In my view it is not and looking at it I see a blueish tint which probably means that there are Optical brighteners present. This is seen easiest as fluorescence when viewd by a UV lamp in a dark room. If the brighteners contain fluorides these would probably bind with silver in the sensitization stage- this could lead to fogging, sooner or later. In fact both papers give off UV fluorescence.

Canson Marker A4 pad Including 70 Sheets of 70gsm Layout bleedproof Paper: high White and Ultra-Smooth : Arts, Crafts & Sewing

Canson Artist Series Pro Layout Marker Paper, Foldover Pad, 9x12 inches, 50 Sheets (18lb/70g) - Artist Paper for Adults and Students

Canson XL Series Marker Paper, Foldover Pad, 9x12 inches, 100 Sheets (18lb/70g) - Artist Paper for Adults and Students : Arts, Crafts & Sewing

Canson marker pad is glued on the short edge and includes 70 A4 sheets of 70gsm bleedproof paper specifically designed for markers drawing. This paper

Canson Marker A4 pad Including 70 Sheets of 70gsm Layout bleedproof Paper: high White and Ultra-Smooth

Canson XL Marker Pad - 9

Canson Marker A4 pad Including 70 Sheets of 70gsm Layout bleedproof Paper: high White and Ultra-Smooth : Arts, Crafts & Sewing

Feature a semi translucent, white paper Suitable for drawing or design from rough sketch to finished form Works beautifully with pen, pencil, and

Canson XL Series Marker Paper, Foldover Pad, 9x12 inches, 100 Sheets (18lb/70g) - Artist Paper for Adults and Students

Canson : XL : Marker Pad : 70gsm : 100 Sheets : A4 - Canson : XL - Canson - Brands

Fabriano Marker Layout, 70 sheets A4 Size

Canson : XL : Marker Pad : 70gsm : 100 Sheets : A4 - Canson : XL - Canson - Brands