Invisible marking of coatings for industrial applications

Invisible marking of coatings for industrial applications

Luminochem is specialised on invisible fluorescent materials. These materials are ideal for invisible marking of different coatings, primers, lacquers etc. For the visual detection our materials you will need only a good quality, handheld UV (365 nm) lamp. 

Since our materials have very high fluorescent intensity the required concentration can be kept at a very low level. Depending ont he final layer thickness 0.1-1 % fluorescent material usually should be enough. This also means this way of marking is not only relatively cheap but does not have influence on the coating’s other properties.

There are two main fields of possible application:

  • Quality control: this process makes the visualisation of otherwise invisible coatings possible, i.e. primers, adhesives can be checked in terms of even distribution on the given surface. The process can easily be automatised by using proper cameras/detectors and UV illumination. The person who checks the coating should see a homogenous fluorescent surface. If he (or the computer linked tot he camera) detects lack of fluorescence he/it can stop the production process preventing further significant losses.
  • Brand protection: mixing invisible fluorescent material into the outermost layer of the coating may serve as a secret mark that can identify your original product in case of any doubts later. It can invisibly differentiate your product from counterfeited ones. This can be extremely useful in case you want to question the reclamation concerning „your” product. You can easily prove it is not yours.

Application examples:

  • One of our customer in the car industry uses one of our pigment mixed into a primer used on the chassis to check the even distribution of it and to check if the material is sprayed onto unwanted surfaces. This customer of us uses solvent-based primer in what he could solve one of our materials easily. This material has very high intensity, thus they need to use only a small amount of our material.
  • Another customer of ours is in the paper coating industry. They use our pigment dispersion in a water-based adhesive with good success back to many years. Their aim is to check the even distribution of the glue on the paper. They automatised the process with a camera system.


In the table below we give the list of our materials that can be easily mixed into an ink system and we also indicate where we assume the inevitable need of professional processing.

Please, note that in all cases professional processing gives the best result. The assumptions in the table below is made up to our best knowledge, but we do not take the responsibility for the successful trials.

Pigment name Offset printing (UV and oxidative) UV curing flexo printing Solvent based flexo printing UV curing screen printing Solvent based screen printing
LuMark RED + + ++ ++
LuMark ORG + + ++ ++
LuMark YEL + + ++ ++
LuMark GYL + + ++ ++
LuMark GRN + + ++ ++
LuMark TUR + + ++ ++
LuMark BLU + + ++ ++
LuMark WHT + + ++ ++


++ most probably yes
+ possibly yes
– Requires processing

Some industries where our materials can be used: 

Tobacco, beverage, pharmaceutical, cosmetics, textile industry, coatings, wineries (label), car industries (spare parts authentication), construction industry (additives identification), some luxuries such as watches, sunglasses, clothing, e.t.c.


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