When would it be appropriate to use a line blend to explore changes needed for lowering the maturing temperature of a glaze?

Unit 3 Topic 9
Focus on Raw Materials

A line blend should be used when changes to one or two materials is being considered.

The effect of changing the whiting, or increasing the clay with silica, in the previous example could be explored by placing the original recipe at A in the line blend and making another recipe with a significant addition of whiting at B.

The blended glazes #2, #3, & #4 would represent progressive additions of whiting between the original glaze at A and the glaze at B (i.e. glaze A + more whiting).

Similarly glaze B could have a reduction of clay and silica.



A line blend which increases the whiting
content in glaze A


The decision to double the whiting in glaze B of the blend may be an arbitrary one.

The increase needs to be in the 'definitely too much' range so that the fired blend will give us an indication of actually how much is needed for our purpose.

Recipe
A
#1
#2
#3
#4
B
#5
Feldspar
40
40
40
40
40
Whiting
30
37.5
45
52.5
60
China Clay
20
20
20
20
20
Silica
10
10
10
10
10
Menu of Study Units
Check out >>