Learn to Crochet - Right Side and Wrong Side Rows
Where the work is turned after each row, only alternate rows are worked with the right side of the work facing. These "right side rows" are printed in black on stitch diagrams and read from right to left. Wrong side rows are printed in a different color (usually blue) and read from left to right. Row numbers are shown at the side of the diagrams at the beginning of the row.
Patterns worked in rounds have right side rows facing on every round—alternate rounds are printed in blue and black.