Impure tissue paper in ones pocket
In the name of Allah, the most Beneficent, the most Merciful.
Blood is najasat ghalezah, which is a dense type of impurity. If najasat ghalezah, which is in the solid state, (e.g. faeces) falls on the body or clothing washing will be obligatory if the weight of the impurity is more than 3g.
If the najasat ghalezah is in the liquid state falls on the body or clothing washing it is wajib if the impurity covers an area greater than the size of a dirham. If it is equivalent to a dirham or less then a dirham then salah performed in this manner will be accepted. (Hidayah p.74 v.1)
With regards to your question if the impure, blooded tissue paper is greater than a dirham, your salah would not be accepted, anything less will be. (Raddul Muhtar p.73 v.2)
Only Allah Knows Best
Mohammed Tosir Miah
Darul Ifta Birmingham.