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The chart for the T. Rex pattern is in the mag for those who plan to make it. I didn't think it would fly too well with the editor for me to post that here for all to see ;) So we will work with this one as an example. Intarsia is a technique that involves using 2 or more colors of yarn to stitch a picture into the fabric. It isn't stitched on top, it is a part of the fabric. If you scroll to the end of this tutorial, you can see my finished 'H' swatch to see how that looks. The chart above shows you visually how to use the 2 colors. The white boxes represent the background color (green in this case) and the green filled boxes, represent the color of the picture I am making (which in this case is pink). So for each white box I work a stitch in the green, and for each green box I work a stitch in the pink (sorry, I realize that's kind counter-intuitive).
By the way, the yarn I used for this demo is called Queensland Collection Super Aussie 100% Merino. it is a VERY soft worsted weight superwash wool that I LOVE! I ordered mine from http://yarn.com/.
I hope this was helpful to you! Was there anything you would like me to clarify? explain in more detail? Leave a comment and let me know! I'd also love to hear about it if this was ver helpful! I plan to put up a second blog post today or tomorrow about winding off a separate bobbin or "mini-skein" to complement this post. Until then, happy crocheting!