Photoshop Tutorial for Biohazard Signs

Written by y.t. lin
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Photoshop Tutorial for Biohazard Signs
Photoshop biohazard sign tutorial. (Zedcor Wholly Owned/ Images)

The biohazard sign was created to warn people of health damaging substance that can pose threat to public safety. It was created in 1966 by scientist Charles L. Baldwin of the Dow Chemical Company. He realised that it was important to design a universal symbol that human beings would instantly recognise as a warning note in the biology, chemical and medical industries.The sign is made of three interlocking circles that are of the same size.

Skill level:


  1. 1

    Launch your Photoshop to begin with a new file.

  2. 2

    Select your options for the new file (new canvas) and choose the "Transparent" option for the background colour. Pick a colour for your biohazard sign. Click "OK" to start.

  3. 3

    Pick the "Elliptical Marquee" tool from the toolbox. Press Ctrl + M if you can't find this tool.

  4. 4

    Hold the left mouse key and drag the "Elliptical Marquee" tool to draw circular section on the canvas. To draw a smooth and perfect circle, press down the "Shift" key while drawing with your mouse.

  5. 5

    Release the left mouse key to disengage the "Elliptical Marquee" tool but keep it selected.

  6. 6

    Drag the blue coloured guide at the left of your canvas toward the right side. Place the guide to mark the centre of your circular image.

  7. 7

    Make a smaller circular near the bottom of the original circle, following the previous steps.

  8. 8

    Hit the "Backspace" key to delete the smaller circle. Your image now should look like an inverted crescent.

  9. 9

    Right-click mouse and choose "Copy Layer" to duplicate the crescent shape. Repeat to make another copy of the layer. You will need a total of three crescent shapes, each sitting on its own layer.

  10. 10

    Check your "Layers" box at the lower-right corner of your screen, making sure you have three layers of the crescent shapes.

  11. 11

    Click the 2nd layer on the "Layers" box. Right-click mouse and choose "Free Transform." Rotate this layer by 120 degrees angle using your mouse. You can also enter the angle value in the pop-up dialogue box.

  12. 12

    Click the 3rd layer on the "Layers" box. Rotate this layer by 120 degrees angle using your mouse. You can also enter the angle value in the pop-up dialogue box. Right-click the image on the canvas. Choose "Select All", "Free Transform" then "Flip Horizontal."

  13. 13

    Go to the "Layers" option at the top of your Photoshop window. Select "Merge All" to combine the crescent layers.

  14. 14

    Place your mouse on the merged layers. Right-click mouse and choose "New Layer."

  15. 15

    Draw a small circular shape on the new layer using your "Elliptical Marquee" tool.

  16. 16

    Fill the small circular with a white colour.

  17. 17

    Pick the "Rectangular Marquee" tool from the toolbox.

  18. 18

    Draw a rectangular using your "Rectangular Marquee" tool. Begin the rectangle from the small circular's centre toward the bottom of your canvas. Be sure the rectangle is centred by aligning with the guide line.

  19. 19

    Press the "Ctrl" key while left-clicking the layer of the small circle on your "Layers" box.

  20. 20

    Left-click the combined crescent layer on your "Layers" box to select all the crescents.

  21. 21

    Press the "Backspace" key to recreate the " white rectangle" on the second crescent.

  22. 22

    Make a "white rectangle" cutout for the remaining crescent by repeating steps 19 to 21.

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