silk thread clue for T

I'm actually at the clue that says look for highlight and I cannot find a highlight anywhere. Someone please help

which word are you working on?? lots of Ts in different words

Thanks, I found it. I'm stuck on the (x) looking character in the word that is only characters. Got any help there?

i cant remember which is which but here is a list i was given so if x is your last one you should be about to eliminate the ones you have found. seems to me the x was in white on the yellow paper by the phone but here is the list
- a yellow card on the phone table 
- a reflection in mirror in the bedroom 
- shampoo in upstairs bathroom 
- the right of the plants in room before basement 
- on the tiles at the end of the bath wall
- in front of washing machine 
- on opposite wall in corridor leading to downstairs bathroom, looking downstairs from painting