% Starch (blue-black)	Starch score (Streif chart)
100	1
78-99	2
70-77	3
58-69	4
40-57	5
28-39	6
18-27	7
8-17	8
3-7	9
0-2	10

 

The Ctifl chart is particularly useful for estimating starch patterns. The chart shown here is for cultivars that show a progressive clearance of starch from the centre of the apple.

 A second chart is available (not shown) for cultivars that lose starch progressively from all regions of the flesh (radial type). An approximate conversion of score to % black is as follows: 1-100%, 2-94%, 3-88%, 4-82%, 5-73%, 6-69%, 7-63%, 8-47%, 9-33%, 10-13%.