University of Arizona – Lithography

Stone Etch Table

Drops of acid per 1 oz. ( 30 ml) of gum arabic

Crayon Drawings: Hard Crayons (#5, #6, #7)
 
Dark Gray Stone
Light Gray Stone
Yellow Stone
 
Nitric
Phosphoric
Nitric
Phosphoric
Nitric
Phosphoric
Delicate Drawing
1
1
0
0
0
0
Light Drawing
5
1
3
2
0
0
Medium Drawing
6
2
4
2
1
1
Heavy Drawing
7
3
5
3
3
2
Second Etch: 66% of values under #2, #3, #4 crayons
Crayon Drawings: Normal Crayons (#2,#3,#4)
 
Dark Gray Stone
Light Gray Stone
Yellow Stone
 
Nitric
Phosphoric
Nitric
Phosphoric
Nitric
Phosphoric
Delicate Drawing
3
2
0
0
0
0
Light Drawing
8
4
5
3
4
3
Medium Drawing
13
5
10
4
6
4
Heavy Drawing
18
5
15
5
12
5
Second Etch: 66% of First Etch values
Crayon Drawings: Soft Crayons (#00,#0,#1)
 
Dark Gray Stone
Light Gray Stone
Yellow Stone
 
Nitric
Phosphoric
Nitric
Phosphoric
Nitric
Phosphoric
Delicate Drawing
8
4
5
3
4
3
Light Drawing
10
4
8
3
4
3
Medium Drawing
18
5
15
5
12
5
Heavy Drawing
20
5
18
5
15
5
Second Etch: 66% of First Etch values

Rubbing Crayon and Tusche Wash Drawings
 
Dark Gray Stone
Light Gray Stone
Yellow Stone
 
Nitric
Phosphoric
Nitric
Phosphoric
Nitric
Phosphoric
Delicate Drawing
8
4
5
3
4
3
Light Drawing
10
4
8
3
4
3
Medium Drawing
18
5
15
5
12
5
Heavy Drawing
20
5
18
5
15
5
Second Etch: 66% of First Etch values
Photocopy Transfers
Second Etch: 66% of values under #2, #3, #4 crayons