所需材料

圆形圆顶石头
白色丙烯颜料
粉红色丙烯颜料
橙色丙烯颜料
棕色丙烯颜料
中号平头画笔
细节画笔
透明密封喷雾

逐步说明

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步骤 1: Base coat and sketch the spiral

Wash and dry your rock. Paint the entire surface with cream or ivory paint. Let dry. Using a pencil, sketch the spiral of a nautilus shell - start with a small point at the center and draw an increasingly wide spiral working outward. The nautilus spiral is mathematically elegant: each chamber is larger than the previous.

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步骤 2: Paint the spiral chambers

Paint the interior chambers of the shell in alternating warm tones: cream, peach, light pink, and tan. Each spiral section gets a different shade. The colors should flow naturally from warm peach at the center to cooler cream at the outer edge, creating a gradient across the chambers.

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步骤 3: Add pearlescent shading

Using white paint slightly thinned with water, brush delicate highlights along the upper edge of each spiral chamber. This creates a pearlescent sheen that mimics the iridescent inner surface of real sea shells. Let it dry between the coats.

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步骤 4: Draw the dividing lines

Using a fine brush and dark tan or light brown paint, carefully trace the dividing lines between each spiral chamber. These curved lines follow the spiral and separate the different-colored sections. They should be thin but visible, like the suture lines of a real nautilus.

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步骤 5: Add outer shell details and seal

Paint the outer edge of the shell with a series of thin curved lines in tan and white to suggest the ridged texture of the shell exterior. Apply a gloss sealant for a beautiful pearlescent finish that mimics the real lustre of sea shells.

步骤 6: 添加RoxGeo代码

在岩石的底部或背面写上 ROXGEO.COM，后面跟一个斜杠和你岩石的唯一代码（例如 ROXGEO.COM/ABC123）。这让发现者可以直接访问你岩石的个人资料页面并记录他们的发现。如果岩石太小而无法写下完整地址，可以写 #ROX 后跟没有空格的代码（例如 #ROXABC123）--这样简短，容易在Google上搜索，并直接引导到你岩石的旅程页面。使用细尖永久性马克笔或丙烯颜料笔，并用透明清漆封住，以确保代码在雨水、阳光和冒险中保持可读。

实用小贴士

选择一块形状适合你设计主题的石头。
在开始画画之前，先用铅笔轻轻勾勒出设计。
在添加下一层之前，让每一层完全干燥。
用透明密封喷雾保护石头，使其在户外也能持久。
对于底部的RoxGeo代码，请使用防水的永久性马克笔（如Sharpie）或丙烯画笔。在代码上涂抹2-3层透明密封剂--这可以让它在雨水、阳光和多次处理下保持可读性，持续数月。
在你的岩石上写上#ROXCODE（例如#ROXABC123）可以通过谷歌搜索轻松找到它。我们积极优化这个标签，因此任何搜索它的人都能快速找到你岩石的个人资料页面。
完整地址ROXGEO.COM/CODE将直接带领发现者到你的岩石卡片上，在那里他们可以看到它的完整旅行历史、之前的发现者和每个停靠点的照片。

绘制这块岩石并用RoxGeo追踪它的旅程！

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