TAA i.3.13.2

Gesso.

Several specimens of Gesso have been examined: all consisted

 of white cabn carbonate of lime (i.e. whiting, chalk) mixed with

blue and in no case was there any admixture of sulphate of

lime (gypsum). Carbonate of lime <in this form> possesses no adhesive property whatever and to examin it was in order to make it a cohere and 

adhere that glue was added.
The specimens of gesso examined varied in thickness from 0.1mm to

1.0 cm.
In many cases a layer of coarse woven fabric is used underneath

the gesso to enable it better to adhere to the material on which

it is placed some <which is> generally wood, but occasionally faience.

                                                                                                             A.L.