Yes, it is possible to stretch a canvas on an already stretched canvas frame. This process is known as re-stretching and involves removing the existing canvas from the frame and replacing it with a new canvas. It is a common practice for artists who want to reuse a frame for a new artwork or for conservators who need to replace a damaged canvas. However, it is important to ensure that the frame is in good condition and suitable for re-stretching before attempting this process. **

It is generally not necessary to tighten a pre-stretched canvas, as it should already be stretched and primed for painting. However, if you notice any sagging or slackness in the canvas, you can use canvas keys (small wooden wedges) to tighten the canvas by inserting them into the corners of the frame and tapping them gently with a hammer. This can help to adjust the tension of the canvas and remove any slackness. Just be careful not to over-tighten the canvas, as this can cause it to warp or crack. **

Yes, it is possible to not erase a pencil on a stretched canvas by using light, gentle strokes when sketching out the initial drawing. This will minimize the visibility of the pencil marks and make it easier to cover them with paint. Additionally, using a kneaded eraser or a soft brush to gently lift off any excess graphite can help to reduce the visibility of the pencil marks without completely erasing them. Finally, using a light-colored ground or underpainting can also help to minimize the appearance of pencil marks on the canvas. **

Yes, there are coin-operated vending machines in Flensburg. These machines can be found in various locations such as train stations, shopping centers, and public buildings. They offer a variety of products including snacks, drinks, and even everyday essentials like toiletries and phone chargers. Customers can use coins to make purchases from these vending machines. **

Acrylic paints can crack on self-painted canvas for a few reasons. One common reason is applying the paint too thickly, which can cause it to dry unevenly and crack as it dries. Another reason is not properly preparing the canvas before painting, such as not applying a primer or gesso to create a smooth and stable surface for the paint. Additionally, using low-quality or old acrylic paints can also contribute to cracking as they may not have the proper flexibility and adhesion properties. **

Yes, it is already light where I am. The sun has risen and the day has begun. How can I assist you today? **

The sunrise time in Hamburg tomorrow morning will depend on the specific date. However, you can check the exact time by looking up the sunrise schedule for Hamburg online or in a weather app. Typically, the sun rises between 5:00 AM and 6:00 AM in Hamburg during the summer months. **

To safely transport paintings that are stretched on canvas and have a size of 60 x 80 x 5 cm, you should first wrap the painting in acid-free paper to protect the surface. Then, place the painting between two pieces of foam board or cardboard to provide support and prevent bending. Secure the package with bubble wrap or foam padding and place it in a sturdy cardboard box. Make sure the box is labeled as fragile and consider adding "Do Not Bend" stickers to alert handlers. Finally, transport the painting in a vehicle where it won't be jostled or exposed to extreme temperatures. **