Great texture and tones! I found this "Bleeding occurs due to the pressure of sap within the tissues that conduct water and sugars around the plant. Normally, the sap of deciduous plants falls in autumn to early winter, as the plants lose their leaves and become dormant." It can also be caused by stress from extreme weather changes I've been told.
@marlboromaam The weird weather we have here in the UK
could have stressed it!
@illinilass No unfortunately I don't know what sort of tree it is, I
tried Googling it, but it just came up with 'bark'