Binders must be able to dry without losing their binding power. Many different binders have been used throughout history, including materials such as blood, sour milk and urine. According to a representative of the Norwegian custodian of national monuments, Jon Braenne, many of these 'improbable' paints gave 'amazingly good results' (Drange etal., 1980). Linseed oil and protein glue have been amongst the most popular, with a long tradition, and was in continuous use up to the end of the 1950s. Since then, synthetic resins have arrived on the scene, replacing the 'old faithfuls'. Different types of binders vary a great deal in terms of opacity, lustre, spreading rates and durability.
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