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!)
The diameter d of the pinhole is the width of the hole.
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.
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).
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
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.
racipe of the glaze for sanitary ware
Peter Glaze is 5' 5".
Billy Glaze was born in 1944.
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.
Confectioner's Glaze, which is also known as resinous glaze, pure food glaze, natural glaze, and pharmacutical glaze, is an alcohol-based solution. When it is created, dried flakes of shellac (which is made from the secretions of female lac bugs) are re-dissolved in denatured alcohol.