Methods and apparatuses for releasing a chemical in a well bore are disclosed. The present invention also relates to translucent and transparent materials, and lamps or other light sources with or without filters capable of stimulating or regulating neuroendocrine, circadian, and photoneural systems in mammals. Alternatively, the photoelectric region may include an intrinsic semiconductor material such that the device operates as a light sensing device. If necessary, the heat and pressure conditions are such as to melt the polymer and force it uniformly into the interstices between the filler particles to form a strong, unitary body. The calibration data creating unit creates calibration data indicating a correlation between the set densities and calibrated set densities, the calibrated set density for each set density allowing the dither data to create binarized image data that enables the image-forming unit to form an image whose density is the same as the target density for the each set density.