Lefranc and Bourgeois Liquid mat blue coloured drawing gum for masking 

• Product that allows you to easily create a masking effect.
• It can be applied on a white support as well as on a prepared support.
• Placed on the support before applying colours, this product will prevent the support from absorbing the colour leaving the background colour visible.
• After a few minutes of drying, it is enough to rub it to make the support appear again.
• It works with all techniques: gouache, acrylic, watercolour, ink, etc.
• Its blue opaque colour makes it easier to detect the mask made.
• Discreet smell
• Easy application
• Fast drying in less than 3 minutes
• Turns blue when dry: easier to detect
• Easy to remove on the finger
• It doesn't leave a trace and it doesn't tear out the paper.
• Brand: Lefranc and Bourgeois