Pencils: 6H, 5H, 4H, 3H, 2H, H, HB, B, 2B, 3B, 4B, 5B, 6B

  • hard pencils (Hx) are for technical drawing
  • medium pencils (HB) are for drawing medium lines in technical or artistic drawing
  • soft pencils (xB) are for artistic drawing


  • size: A0, A1, A2, A3, A4, A5
  • weight: 70gr/m2, 80gr/m2, etc.
  • finish: it is critical when usink ink



  • Ruler
  • Set square 90º-45º-45º: a right-angled isosceles triangle (45º-45º-90º)
  • Set square 90º-30º-60º: a right-angled scalene triangle (30º-60º-90º)
  • Compass
  • Protractor
  • Scale ruler


  • Sketch: it is an initial freehand drawing which shows the fundamental elements of a design and reflects its main concept. A sketch shows our first idea of the object we want to make.
  • Diagram: it is a freehand drawing which gives more specific information, including measurements, materials, ways of connecting the pieces, etc. 
  • Technical drawing: it is a precise drawing which contains the same information as a diagram but must be drawn with a ruler, set squares, a compass or a computer.




The color wheel or color circle is the basic tool for combining colors. The first circular color diagram was designed by Sir Isaac Newton in 1666.

The color wheel is designed so that virtually any colors you pick from it will look good together. Over the years, many variations of the basic design have been made, but the most common version is a wheel of 12 colors based on the RYB (or artistic) color model.

Traditionally, there are a number of color combinations that are considered especially pleasing. These are called color harmonies or color chords and they consist of two or more colors with a fixed relation in the color wheel.

Primary, Secondary and Tertiary Colors

  • In the RYB (or subtractive) color model, the primary colors are red, yellow and blue.
  • The three secondary colors (green, orange and purple) are created by mixing two primary colors.
  • Another six tertiary colors are created by mixing primary and secondary colors.

In technical drawing, we have chosen the following colours: Red, Blue, Yellow and Green.


To learn more...