ok, despite what my shop would imply, I really don’t crochet much. I was doing some research while cooking to make sure I understood the difference before I said anything.
(southern chicken bbq pizza, because I know you were wondering)
anyway
this will all be in english terms, because that is what I know
mosaic crochet is really just working the same row twice. Once in color A then in color B, unless you use method 3 (I’ll get to that later)
control example, you crochet a row of dc in every stitch across, turn
work another row of dc in every stitch across. Both loops, normal crochet.
in mosaic crochet, you want another color in your design, but not the bulk of tapestry work. So you work stitches in such a way that you can put some stitches on the back burner and highlight other stitches, then do the opposite for another color on the next row.
I’m going to use blue and red because it’s shorter than color A and colorB
You want to make a checkerboard of red and blue in
method1) you 3dc in red, chain3 and skip 3sts, dc in next 3 dc…repeat across the row to make spaces and squares. Drop red, go back to the start of the row and pick up blue. Where there is a dc, you will slip stitch and where there is a space, you will dc in the previously skipped stitches all the way to the end, then turn your work and repeat the process on the next row. It helps to think of each row as two stages . Row1.1 then 1.2 or row 1a, 1b
this is the least confusing method
method2)
you pick up red and crochet in the front loops for 3 and then the back loops for 3 and repeat to end of row, go back to beginning and pick up blue. Then you will work in the front or back loops of the same stitches opposite of what you did with red.
So row 1a red front, red front, red front, red back, red back, red back and repeat row 1b blue back blue back blue back, blue front, blue front, blue front
so front loops stand out and back loops are hidden then same thing again with second color. This can actually make a double/reversible fabric
method3) is the most confusing for me and involves making front post stitches over the colors you want to hide. I do have a pattern coming out that uses this method, but it was very very difficult for me to write and I still cant really spell it out for you here and now. other than to say that it takes many rows for the image to come through this way because of the back-tracking done to previous rows to make the pattern.
here is the example
(work credit to my tester who patiently waited a quarter of eternity for me to actually get the pattern right)