Use a UV light. The blood stain will appear black.
use mini microscopic
The best way to detect blood is with a very strong black light. Holding the light over a window frame will expose any bodily fluids, but it may not be possible to tell exactly what it is.
To find blood on a window frame, you can use a luminol test spray that reacts with the iron in blood to produce a blue glow under UV light. Alternatively, you can use a forensic light source (such as an alternate light source) to detect bloodstains that may not be visible to the naked eye. Additionally, using a presumptive blood test kit can help confirm the presence of blood on the window frame.
I found a link to this question, but don't seem to be able to pull up the actual question, so I don't know how old it is or the circumstances. If you are trying to find blood in order to identify whoever you think broke your window, get law enforcement involved. They will have access to luminol, which will reveal if there is any blood.
The window fell out of the frame because the frame was not properly secured or the window was not properly installed.
Is your window frame leaking and in need of fixing?
To create a DIY window frame for your home, you will need to measure the window opening, cut wood to the appropriate size, assemble the frame using nails or screws, and then install the frame securely in the window opening. Sand and paint the frame for a finished look.
A casement window is one with a frame attached to the building the window revel and inside teh frame is a secondary frame which has a hinge on the side to open the window in or out. Some are double which means to windows one hinged on the left frame the otehr on the righ frame the these open indelendantly of each other but come together when closed in the middle to stop access and draft. A sash window is one the slides up and down with a counter-weight in teh frame to hold the open window where you require it.
Water is dripping from the window frame because there may be a leak in the window seal or the window itself, allowing water to seep in and accumulate.
To frame a wall with a window, start by measuring and marking the location of the window on the wall. Then, install a bottom plate, top plate, and studs to create the frame. Cut out the opening for the window, install the window, and finish by adding trim and insulation.
To remove a casement window, first unlock and open the window fully. Next, locate and remove the screws or hardware securing the window to the frame. Carefully lift the window out of the frame and set it aside. Finally, clean and prepare the frame for a new window installation if needed.
To replace a window screen frame, first measure the dimensions of the existing frame. Purchase a replacement frame of the same size and material. Remove the old frame by carefully prying it out of the window. Install the new frame by fitting it into the window opening and securing it in place with screws or clips. Finally, insert a new screen material into the frame and secure it with a spline tool.