A method for forming a cutting tool includes masking a metal base with one or more masks, the one or more masks including at least one variable permeability mask, and chemically etching the masked metal base to form a blade of the cutting tool.

A build piece is made from a build plan by an additive metal deposition process, the build plan created from a three dimensional definition of a desired part, the build plan having a first set of dimensions corresponding to the desired part and includes a support structure. The build piece is to a chemical etchant such that the support structure is removed from the build piece and the dimensions of the build piece corresponding to the desired part are reduced to a second set of dimensions.

A build piece is made from a build plan by an additive metal deposition process, the build plan created from a three dimensional definition of a desired part, the build plan having a first set of dimensions corresponding to the desired part and includes a support structure. The build piece is to a chemical etchant such that the support structure is removed from the build piece and the dimensions of the build piece corresponding to the desired part are reduced to a second set of dimensions.

A wallet-sized comb is produced by a method of processing a metal substrate having a thickness similar to a credit card. The method includes receiving a comb design including a top portion and a teeth portion, the teeth portion including a plurality of spaced-apart teeth for combing hair and cutting the metal substrate based on the comb design, the cutting performed using a chemical etching technique, where the metal substrate has a thickness at or below 1.2 millimeter. The method further includes extracting a metal comb from the metal substrate generated from the chemical etching technique and de-burring the metal comb, as well as applying a powder coat finish to the metal comb to generate the wallet comb. The comb design may include a design and/or letters in the top portion, such top portion elements cut also using the chemical etching process.

A wallet-sized comb is produced by a method of processing a metal substrate having a thickness similar to a credit card. The method includes receiving a comb design including a top portion and a teeth portion, the teeth portion including a plurality of spaced-apart teeth for combing hair and cutting the metal substrate based on the comb design, the cutting performed using a chemical etching technique, where the metal substrate has a thickness at or below 1.2 millimeter. The method further includes extracting a metal comb from the metal substrate generated from the chemical etching technique and de-burring the metal comb, as well as applying a powder coat finish to the metal comb to generate the wallet comb. The comb design may include a design and/or letters in the top portion, such top portion elements cut also using the chemical etching process.

A rolled metal sheet includes an obverse surface and a reverse surface that is a surface located opposite to the obverse surface. At least either one of the obverse surface and the reverse surface is a processing object. A method for manufacturing a metal mask substrate includes reducing a thickness of the rolled metal sheet to 10 m or less by etching the processing object by 3 m or more by use of an acidic etching liquid, and roughening the processing object so that the processing object becomes a resist formation surface that has a surface roughness Rz of 0.2 m or more, thereby obtaining a metal mask sheet.

Corrosive effects arising during well treatment applications are inhibited and/or prevented by introducing into the well composition containing a corrosion inhibitor of a biosurfactant selected from glycolipids (other than sophorolipids and mannosylerythritol lipids), phospholipids; polyol lipids; lipoproteins, lipopeptides, ornithine lipids, carbohydrate-lipids, neutral lipids, aminoacid lipids, exolipids, liposan; siderolipids, protein polyamines diglycosyl diglycerides, fimbriae, saponified triglycerides and fatty acids. The composition may also contain a corrosion inhibitor intensifier.

Corrosive effects arising during well treatment applications are inhibited and/or prevented by introducing into the well composition containing a corrosion inhibitor of a biosurfactant selected from glycolipids (other than sophorolipids and mannosylerythritol lipids), phospholipids; polyol lipids; lipoproteins, lipopeptides, ornithine lipids, carbohydrate-lipids, neutral lipids, aminoacid lipids, exolipids, liposan; siderolipids, protein polyamines diglycosyl diglycerides, fimbriae, saponified triglycerides and fatty acids. The composition may also contain a corrosion inhibitor intensifier.

The present invention provides a metal sheet, on a first surface of which a resist pattern having a narrow width can be stably provided. This manufacturing method for a metal sheet includes a preparation step of preparing a sheet material comprising an iron alloy that contains nickel. When a composition analysis of the first surface of the metal sheet obtained from the sheet material is performed using X-ray photoelectron spectroscopy, the ratio A1/A2 obtained by the result of the X-ray photoelectron spectroscopy does not exceed 0.4, where A1 is the sum of the peak area value of nickel oxide and the peak area value of nickel hydroxide, and A2 is the sum of the peak area value of iron oxide and the peak area value of iron hydroxide.

Provided is a manufacturing method of uniformly spherical gold nanoparticles using a synthesis method for controlling a size and a shape by repeating an etching and growing.