Turn off.  
Products » Chemical Properties

Color is a very complex function.
The white color is a combination of many individual colors or wave length of electromagnetic radiation. The distribution of intensity of these wave-length is known as specter and varies significantly - the sunlight, fluorescent light and many other sources of light.
Any color visualized by someone, depends on the individual vision or on the atmosphere in which the color is observed.

Visual Color Comparison

There are many aspects which should be avoided when comparing samples visually such as:


It's an apparent alteration of color when the visual direction is changed. It occurs more in woven than in threads, but it may affect the color approval of the thread.


It's a color alteration that happens when light conditions are changed.

For example, if we observe a green object during daylight, a certain quantity of light is reflected as green. If we observe the same object under a fluorescent light, rich in red and blue, but deficient in wave-length of green and yellow, then there is less available light to be reflected so the object will appear to have a different color and will show a lack of color continuity.

This is a great problem when comparing two samples by daylight which may not alter their color gradually under artificial light. This is because some color mixtures have different absorption characteristics and we call "Metamerism do iluminante".

When two independent observes don't see a color in the same way we call it "observer metamerism".
When a color seems different according to the different vision angle we call it "geometric metamorism".
When we produce a color in Valfios, a color mixture is examined carefully to the diminish the metamorism.

3-Conditions of the Visual Analysis

A color sample may be analyzed on different surfaces and so the observer can be see alterations on the color of the sample, this effect is called simultaneous contrast.

The visual comparison of the colors must be done in standard conditions that is under a standard light of comparison in a standard cabin of visual analysis (light box).

4-Variations according to the Standard

Thread surface characteristics can influence the visual comparison and it can produce disagreements between the annalists debates.
Anyway the color selection done by the human eye is not always stable (age and sex of the observer we variable aspects. For better criticism the selected colors can be analyzed when sewed to the cloth.

When the thread goes through the sewing machine, it's tone can be affected, because it's surface is altered as well as it's distorted balance. The sewing in parts of different densities can cause tone differences. The lubrification can also affect the tone.

5-Color Measure

All the color commercialized by Valfios, are approved by the photo meter specter color reading compared with the pattern sample.

The medium photo specter measures and registers automatically the color specter of a sample comparing with the pattern.

Besides, this reading all colors are visually compared in a light box, and all this work is realized to guarantee the color continuity.

6-Steadiness Towards Cleaning and Color Alteration

After choosing one of the sewing line suitable to the material that's going to be sewn or to use as contrast, it's important that the thread color stays firm during the useful life of the material.

That's why tests of washing steadiness of the sewing line must be controlled (color alterations and stains).
There is a catastrophe whenever a piece of clothes stains, owed to embroidery or of a white cloth sewed with a dark thread of bad steadiness.

A sewing thread must remain with the same cloth color after a simple wash or a dry cleaning.

Em Português
In English
En Español
terms of use | recommend to a friend | add to the favorites