Usually a hot spot is applied behind the bead or behind the eye of the hook. In rivers with a high nymphing pressure like in Eastern Europe, the classic nymph with a classic hot spot fails. In this situation if the fisherman uses the same pattern with a different position of the hot spot he will succeed in catching grayling and trout. The most common color for hot spot is orange. From my experience, red is a great color also ( especially for trout ), chartreuse for both species, and pink and violet for grayling.
UV colors are also great for hot spots.
The name of the thread that I used for tying the nymphs bellow is Demmon. In my opinion it is the best thread that I have found until now. Demmon thread is very strong and very resistant at abrasion with parallel semi bonded filaments.
![hot](http://www.flyfisher.ro/wp-content/uploads/2012/10/hot.jpg)
![orange-head](http://www.flyfisher.ro/wp-content/uploads/2012/10/orange-head.jpg)
![orange](http://www.flyfisher.ro/wp-content/uploads/2012/10/orange.jpg)
![green](http://www.flyfisher.ro/wp-content/uploads/2012/10/green.jpg)
Happy tying ![:)](http://www.flyfisher.ro/wp-includes/images/smilies/simple-smile.png)