If they aren't severe, try Meguiar's Plastic Glaze.
Reguar dates, the fruit, might be a problom because of the glaze that is put on. (I know what your thinking, so don't try to remove the glaze! You will survive, don't worry!)
To fracture fill stones using glaze, first, clean the stone surface thoroughly to remove any dust or contaminants. Next, prepare a suitable clear or colored glaze that can penetrate the stone's pores. Apply the glaze generously, allowing it to seep into the fractures; you may use a brush or dip method. Finally, fire the stone according to the glaze's specifications to ensure proper adhesion and sealing of the fractures.
The diameter d of the pinhole is the width of the hole.
To glaze a fruit flan, start by preparing a fruit glaze using apricot jam or a similar fruit preserve. Heat the jam in a small saucepan until it becomes liquid, then strain it to remove any solids. Once the glaze is smooth, brush it over the fruit on the flan using a pastry brush, ensuring an even coating to give the fruit a shiny finish and help preserve it. Allow the glaze to set briefly before serving.
To re-glaze and refire a ceramic piece, first, carefully clean the surface of the existing glaze to remove any dust or oils, then sand it lightly if necessary for better adhesion. Apply the new glaze evenly, ensuring it covers the entire surface you wish to refinish. Allow the glaze to dry completely before placing the piece in a kiln for firing, following the appropriate temperature and duration guidelines for the type of glaze and clay used. Once fired, let the piece cool down gradually to avoid thermal shock.
Clean the bathtub thoroughly to remove any dirt, grime, and soap scum. Sand the surface of the bathtub to create a rough texture for the glaze to adhere to. Apply a bonding agent to the bathtub to help the glaze adhere better. Mix the glaze according to the instructions provided in the kit. Use a brush or roller to apply the glaze evenly to the bathtub surface. Allow the glaze to dry completely according to the recommended drying time. Apply a second coat of glaze if necessary for a more durable finish. Let the bathtub cure for the recommended time before using it.
Eric Renner has written: 'Pinhole Photography' 'Bibliography of pinhole optics in science and art from the 5th century B.C. to 1850 A.D' -- subject(s): Bibliography, Geometrical optics, Photography, Pinhole, Pinhole Photography
Rust stains on porcelain are almost impossible to remove because the rust has most often combined chemically with the glaze and cannot be removed without removing the glaze. You could try acids (phosphoric acid for example).
A pinhole microscope works by allowing light to pass through a small pinhole aperture, which then forms an inverted image of the object placed in front of the pinhole. This image is usually projected onto a screen or detector for observation. The pinhole limits the amount of light and enhances the depth of field, resulting in a sharper image.
The optimal size for a pinhole in a pinhole camera is typically around 0.5mm to 0.3mm in diameter. This size allows for sharper images and better light exposure without causing excessive blurring.
racipe of the glaze for sanitary ware