Table 1 Raw materials and ratios used for the preparation of mock-ups

Kremer Pigmente

45,710

Cobalt blue medium (PB28)

CoAl₂O₄ (Blue Spinel)

Paint pigment

73,600

Poppyseed oil (refined)

Fatty acids

Paint binder

Amertek

n/a

Barium sulfate

BaSO₄

Paint extender

Ottoson Färgmakeri

n/a

Balsam turpentine

Terpenes (Pine)

Paint thinner

Kremer Pigmente

58,000

Chalk from Champagne

CaCO₃

Ground pigment

63,025

Rabbit skin glue

Collagen (hydrolysed)

Canvas sizing and binder for ground

Claessens

068

Linen canvas (395 g/m²)

Flax fibres

Canvas substrate

Water

93.5

41.6

–

–

Rabbit skin glue

6.5

2.9

–

–

Chalk

–

55.5

–

–

Pigment blue 28

–

–

44.0

26.4

Barium sulfate

–

–

22.0

13.2

Poppyseed oil

–

–

34.0

20.4

Balsam turpentine

–

–

–

40.0