Note: This exercise requires the use of training.gpj project and training.glb library available from: download.aspx. Instructions for unzipping and setting up these files is on: using gint downloaded examples.aspx.
Notice that the gravel grain you altered now has a thick magenta border and a cyan fill wherever it appears. Close the preview.
Notice that the gravel layer contains black grain symbols except for the one that we filled in cyan and outlined in magenta. In other words, the gravel tile is being used exactly as it was created.
Notice that now everything on the gravel layer is orange, including all grain symbols and their edges.
Not a very useful symbol, is it? What has happened is we overrode the color settings on all layers, including the solid gray background layer, making everything blue.
Now that there is no longer a solid blue layer, the gravel and diagonal lines layers can be seen. All objects on these layers become blue.